Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Chemical symbol for Selenium is Se. The percentage of an element produced in the top producing country. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Its primary use is in alloys and in glass production. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. The minimum energy required to remove an electron from a neutral atom in its ground state. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Selenium is a other nonmetal element. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The chemical symbol for Gold is Au. Technetium is the lightest element whose isotopes are all radioactive; none are stable. The chemical symbol for Selenium is Se. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The image is of a crescent moon against a cratered surface. Selenium is not an abundant element. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. It is also used as a catalyst in some chemical processes. These values were determined using several different methods. Atomic Number of Selenium is 34. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. This is where the artist explains his interpretation of the element and the science behind the picture. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The information contained in this website is for general information purposes only. At first he thought it was the element tellurium because it gave off a strong smell of radishes when heated, but he eventually realised that it was in fact a new element. Low = substitution is possible with little or no economic and/or performance impact. The chemical symbol for Osmium is Os. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Selenium. It is the fourth most common element in the Earth’s crust. Thorium is moderately hard, malleable, and has a high melting point. The chemical symbol for Gadolinium is Gd. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Discoverer: Davy, Sir H. and Thénard, L.-J. The element symbol of selenium is Se. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. … While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. Selenium is a non-metallic element that carries the chemical atomic number 34. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. That was Cambridge University's Bernie Bulkin with the story of Selenium. Selenium. Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. If you continue to use this site we will assume that you are happy with it. Elements are organised into blocks by the orbital type in which the outer electrons are found. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The chemical symbol for Neptunium is Np. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. al. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. Thousands of new, high-quality pictures added every day. A horizontal row in the periodic table. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. Find Selenium Chemical Element Sign Atomic Number stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. The chemical symbol for Radium is Ra. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. The chemical symbol for Selenium is Se . It has 34 protons and 34 electrons and a mass number of 78.96. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. It is even less abundant than the so-called rare earths. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. The chemical symbol for Tantalum is Ta. Used in exp. Period Number: 4. Selenium (Se). Lead is a heavy metal that is denser than most common materials. The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. Melting Point: 493.65 K (220.5°C or 428.9°F) Boiling Point: 958 K (685°C or 1265°F) Density: 4.809 grams per cubic centimeter. The chemical symbol for Selenium is Se . Used in blueprints: 16x. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Each allotrope has different physical properties. Its symbol is Se and belongs to the group of nonmetals and its habitual state in nature is solid. The chemical symbol for Iron is Fe. The nucleus consists of 34 protons (red) and 45 neutrons (orange). The chemical symbol for Europium is Eu. Glossary. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – shell and 6 electrons in its outermost shell N. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. An organic form of selenium, selenomethionine, is found in foods. It is located in Group 16 of the periodic table. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). The availability of suitable substitutes for a given commodity. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Please enable JavaScript to access the full features of the site. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Selenium, Se, atomic number 34. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. It is also used as a catalyst in some chemical processes. Lead is widely used as a gamma shield. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. Selenium — (pronEng|səˈliniəm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. In fact their absorption cross-sections are the highest among all stable isotopes. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. The chemical symbol for Americium is Am. Actinium is a soft, silvery-white radioactive metal. The chemical symbol for Helium is He. Where more than one isotope exists, the value given is the abundance weighted average. Selenium has atomic number 34, meaning each atom has 34 protons. Values are given for typical oxidation number and coordination. Murray Robertson is the artist behind the images which make up Visual Elements. For more information on the Visual Elements image see the Uses and properties section below. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Chemical element of periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. is a rare earth element with a metallic silver luster. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. In the periodic table, potassium is one of the alkali metals. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. A measure of how difficult it is to compress a substance. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. It is the heaviest essential mineral nutrient. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Selenium with Atomic Number Z = 34 and Mass Number A = 78.96 is in group VIA and period 4 of the periodic table of the elements.# It has sulfur on top and arsenic next to it. Members of a group typically have similar properties and electron configurations in their outer shell. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. A higher recycling rate may reduce risk to supply. Melting point 494K. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. Atomic Weight: 78.971. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. The chemical symbol for Argon is Ar. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The temperature at which the solid–liquid phase change occurs. The chemical symbol for Boron is B. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Members of a group typically have similar properties and electron configurations in their outer shell. Density (g cm−3) Selenium (Se). The tendency of an atom to attract electrons towards itself, expressed on a relative scale. A measure of how difficult it is to deform a material. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. We welcome your feedback. The sum of the oxidation states within a compound or ion must equal the overall charge. Its boiling point is the lowest among all the elements. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Mercury is Hg. Text © The Royal Society of Chemistry 1999-2011 Subtype: Raw material 4. Density is the mass of a substance that would fill 1 cm. The chemical symbol for Chromium is Cr. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Bilder zu Selenium is a chemical element with symbol Se and atomic number 34 Lizenzfreie Fotos Image 137149580. The chemical symbol for Praseodymium is Pr. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. The chemical symbol for Terbium is Tb. The chemical symbol for Mendelevium is Md. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The percentage of the world reserves located in the country with the largest reserves. Thulium is the thirteenth and third-last element in the lanthanide series. If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department by email. High = substitution not possible or very difficult. The chemical symbol for Astatine is At. These muds are either roasted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate to release the selenium. Selenium chemical element. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Copyright of and ownership in the Images reside with Murray Robertson. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. Political stability of top reserve holder. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. Selenium is an element of group VIA and period 4 of the periodic table with Atomic Number Z=34 and Mass Number A=78.96 [1]. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. The rationale is that low selenium levels are associated with weakened immune systems, since with lack of antioxidant capacity there is stress on the immune system. 113Cd has specific absorption cross-section. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. The chemical symbol for … High = substitution not possible or very difficult. It provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Selenium Atomic Number and Electronic Configuration Atomic number of selenium is 34. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Our Website follows all legal requirements to protect your privacy. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Each entry has a full citation identifying its source. 4) What is the number of valence electrons for selenium? Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. The chemical symbol for Polonium is Po. The atomic number is the number of protons in the nucleus of an atom. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Because of its high chemical reactivity, barium is never found in nature as a free element. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. It is given by the ratio of the pressure on a body to the fractional decrease in volume. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. Yum! Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. 1) You may use almost everything for non-commercial and educational use. 400 micrograms per day is set as the safe upper intake level in humans. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Atomic weight of Selenium is 78.971 u or g/mol. What is Atomic Number Density - Definition. Classified as a nonmetal, Selenium is a solid at room temperature. Selenium is used to make pigments for ceramics, paint and plastics. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Carbon is one of the few elements known since antiquity. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Step-2: We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. It has been widely used in electronic devices. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Selenium is a non-metallic element that carries the chemical atomic number 34. Conne - 2AP4NTD from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Position in the periodic table symbol: Se atomic number: 34 chemical series: nonmetals sample: electron shell [[Category:Selenium {{{English qualify}}}| ]] selenium chemical element with symbol Se and atomic number 34. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. The chemical symbol for Neodymium is Nd. Berkelium is a member of the actinide and transuranium element series. The chemical symbol for Lanthanum is La. It is widespread, and accumulated in various foods, such as nuts, tuna, and lobster, so it is rare for humans to have a selenium deficiency. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. 2) You may not distribute or commercially exploit the content, especially on another website. Its primary use is in alloys and in glass production. The chemical symbol for Nobelium is No. It is obtained as a byproduct of the processing of these ores, from the anode mud of copper refineries and the mud from the lead chambers of sulfuric acid plants. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. The chemical symbol for Cerium is Ce. What's in a name? Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. In nuclear reactors, promethium equilibrium exists in power operation. The chemical symbol for Barium is Ba. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. The atomic number of each element increases by one, reading from left to right. The chemical symbol for Samarium is Sm. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Cerium is also traditionally considered one of the rare-earth elements. 78.971. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Under standard conditions, it is the lightest metal and the lightest solid element. The chemical symbol for Tellurium is Te. The name samarium is after the mineral samarskite from which it was isolated. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. Images © Murray Robertson 1999-2011 Phase at Room Temperature: Solid. It has the atomic number 34 in the periodic table. The colour ranges from grey metallic to red glassy. The role of the element in humans, animals and plants. Astatine is the rarest naturally occurring element on the Earth’s crust. Europium is one of the least abundant elements in the universe. The chemical symbol for Promethium is Pm. Elements are organised into blocks by the orbital type in which the outer electrons are found. Selenium is a chemical element with the symbol Se and atomic number 34. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. 34 2) Write the full electron configuration for selenium following the (n+l) rule? These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). History and Discovery . Values are given for typical oxidation number and coordination. The chemical symbol for Titanium is Ti. Group Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Atomic radius, non-bonded The five stable isotopes of selenium are Selenium (Se) is a grey non metal that can also exist as a red allotrope. Neodymium is a soft silvery metal that tarnishes in air. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Period Neptunium is the first transuranic element. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. The chemical symbol for Beryllium is Be. Used for tech broker: 0x. Both sulfur and arsenic have some healing properties, and since neighbors in the periodic table have similar properties, it is not surprising that selenium seems to influence human health. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Atomic Number of Selenium Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. See also: Atomic Number – Does it conserve in a nuclear reaction? The origin of the name comes from the Greek word selene meaning moon. Type: Raw. Tellurium is chemically related to selenium and sulfur. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Although it is uncommonly found, selenium does exist in relatively pure form, free in nature. The chemical symbol for Arsenic is As. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Collected on planet surfaces and from asteroids.Selenium, Se, atomic number 34. It is given by the ratio of the shear stress to the shear strain. Se is a non-metal. The chemical symbol for Platinum is Pt. Selenium is known to have over 20 different isotopes; however, only 5 of them are stable. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Atomic Number – Does it conserve in a nuclear reaction? The chemical symbol for Sodium is Na. Selenium (selenium atoms only) has several different forms. The chemical symbol for Rhenium is Re. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. You do not have JavaScript enabled. The chemical symbol for Thulium is Tm. Krypton is a fictional planet in the DC Comics universe, and the native world of the super-heroes Superman, Supergirl, and Krypto the "super dog". The inorganic chemistry textbooks that I studied from talk extensively about sulphur and, where appropriate, say things like 'selenium also forms similar acids', or 'selenium also has many allotropic forms'. Used in synthesis: 5x. The chemical symbol for Berkelium is Bk. Its chemical symbol is Se and its atomic number is 34. The temperature at which the solid–liquid phase change occurs. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. Selenium is located at position 34 on the periodic table. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The chemical symbol for Lutetium is Lu. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. It is a noble metal and a member of the platinum group. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Iron is a metal in the first transition series. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. A measure of the propensity of a substance to evaporate. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. effects: 3x. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. The chemical symbol for Silver is Ag. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Plutonium is Pu. It is a soft, silvery-white alkali metal. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. Group Number: 16. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Uranium is a silvery-white metal in the actinide series of the periodic table. It is also used as a catalyst in some chemical processes. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. © 2019 periodic-table.org / see also It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Pure radium is silvery-white alkaline earth metal. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, silver, or lead. Element Classification: Non-metal. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical symbol for Californium is Cf. Zirconium is widely used as a cladding for nuclear reactor fuels. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Cerium is the second element in the lanthanide series. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. Where more than one isotope exists, the value given is the abundance weighted average. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure It has the symbol Se. The chemical symbol for Uranium is U. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. 34. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The chemical symbol for Thorium is Th. Know everything about Selenium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure. The configuration of these electrons follows from the principles of quantum mechanics. Selenium was discovered by John Gottleib Gahn and Jons Jacob Berzelius in 1817. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Selenium is a chemical element with symbol Se and atomic number 34. It is one of the least reactive chemical elements and is solid under standard conditions. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. It is therefore useful in photocells, solar cells and photocopiers. The RSC maintains this Site for your information, education, communication, and personal entertainment. Group Name: Chalcogen. It is located in Group 16 of the periodic table. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. Molecule and communication background. Uranium has the highest atomic weight of the primordially occurring elements. Selenium is a metallic gray chemical element with an atomic number of 34. The chemical symbol for Zinc is Zn. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. Major advantage of lead shield is in its compactness due to its higher density. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Selenium is a chemical element. Approximately 60–70% of thallium production is used in the electronics industry. [Ar]3d10 4s2 4p4 Are these correct? Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. The atomic number of each element increases by one, reading from left to right. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Bond enthalpy (kJ mol−1)A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Commonly identified with the chemical symbol of SE, it is an example of an element that is considered to the important in the proper function of the body. It has the atomic number 34 in the periodic table. This is approximately the sum of the number of protons and neutrons in the nucleus. Selenium 74 Metal is one of over 250 stable metallic isotopes produced by American Elements for biological and biomedical labeling, as … We hope that you enjoy your visit to this Site. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. The chemical symbol for Holmium is Ho. The chemical symbol for Scandium is Sc. The availability of suitable substitutes for a given commodity. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. Sign with atomic number and atomic weight. Selenium Description. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Uncombined elements have an oxidation state of 0. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – … Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). The chemical symbol for Cadmium is Cd. Its properties are thus intermediate between those of chlorine and iodine. The element occurs in copper ores and rare minerals … But it's not all bad news. The arrangements of electrons above the last (closed shell) noble gas. Its chemical symbol is Se. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Melting point 494K. Add caption Step-1: First, find the atomic number of selenium from periodic table. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. It is a nonmetal, with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities… Read More » Selenium Chemical Element Properties Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. Download royalty-free .Selenium Atomic Number icon on white background stock photo 75128155 from Depositphotos collection of millions of premium high-resolution stock photos, vector images and … Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. The chemical symbol for Tin is Sn. So much for trying to do a "wikipedia" search for this "hidden" element! Neptunium metal is silvery and tarnishes when exposed to air. — In-game description Selenium is a Raw Material introduced in v2.0. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Tellurium is far more common in the universe as a whole than on Earth. The chemical symbol for Selenium is Se. The chemical symbol for Chlorine is Cl. Elemental sulfur is a bright yellow crystalline solid at room temperature. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Manganese is Mn. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. The chemical symbol for Bromine is Br. It is indicated by the symbol Se and the atomic number of selenium is 34. The bulk properties of astatine are not known with any certainty. The percentage of a commodity which is recycled. Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. Atomic Symbol. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.