Period Atoms of the same element with different numbers of neutrons. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table, Periodic Table Element Comparison tool, Element Property trends This is where the artist explains his interpretation of the element and the science behind the picture. Low = substitution is possible with little or no economic and/or performance impact. The chemical behavior and reactions of these elements are similar. Melting point Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. Visualize trends, 3D orbitals, isotopes, and mix compounds. So it can clear up an itchy scalp but it might make you stink in the process. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. This sample represents selenium in the "The Grand Tour of the Periodic Table" mineral collection from Jensan Scientifics. It converts light into electricity. Murray Robertson is the artist behind the images which make up Visual Elements. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. Where the element is most commonly found in nature, and how it is sourced commercially. Se is a non-metal. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. It is a toxic nonmetal that is chemically related to sulfur and tellurium. Selenium is added to synthetic rubber to improve resistance to abrasion, it has been added to brass, along with bismuth, to replace lead in pipes, and it is used, as sodium selenate, as an insecticide to stop attacks on flowering plants such as chrysanthemums and carnations. That was Cambridge University's Bernie Bulkin with the story of Selenium. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. A measure of how difficult it is to compress a substance. Electron configuration Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. Each allotrope has different physical properties. Covalent radiusHalf of the distance between two atoms within a single covalent bond. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. The element occurs in copper ores and rare minerals such as … Selenium-lithium batteries are widely used as they have high electrical conductivity. 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". It was discovered by Jons J. Berzelius in 1817. 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'. The percentage of an element produced in the top producing country. A horizontal row in the periodic table. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. The energy released when an electron is added to the neutral atom and a negative ion is formed. How slighted is this important element! ... Selenium acts as a catalyst in some microorganisms. Values are given for typical oxidation number and coordination. Please enable JavaScript to access the full features of the site. Krypton has been portrayed consistently as having been destroyed just after Superman's flight from the planet, with exact details of its destruction varying by time period, writers and franchise. The description of the element in its natural form. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. It is indicated by the symbol Se and the atomic number of selenium is 34. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. The mass of an atom relative to that of carbon-12. Selenium is used to make pigments for ceramics, paint and plastics. Members of a group typically have similar properties and electron configurations in their outer shell. These values were determined using several different methods. If you are in any doubt, please ask. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. The origin of the name comes from the Greek word selene meaning moon. The color of amorphous selenium is either red (in powder form) or black (in vitreous form). It is defined as being the charge that an atom would have if all bonds were ionic. The RSC maintains this Site for your information, education, communication, and personal entertainment. The availability of suitable substitutes for a given commodity. In no event shall the RSC be liable for any damages including, without limitation, indirect or consequential damages, or any damages whatsoever arising from use or loss of use, data or profits, whether in action of contract, negligence or other tortious action, arising out of or in connection with the use of the material available from this Site. Word Origin: Greek Selene: moon. Density (g cm−3) A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. The number of protons in an atom. Half of the distance between two atoms within a single covalent bond. Group. Some elements exist in several different structural forms, called allotropes. The chemical symbol for Selenium is Se. Symbol: Se. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. The RSC makes no representations whatsoever about the suitability of the information contained in the documents and related graphics published on this Site for any purpose. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. The name is derived from 'selene', the Greek name for the Moon. There have been numerous studies, none of them very conclusive, about the possible role of selenium in cancer prevention, and in increasing the efficacy of chemotherapy. Villanova lived from about 1235 to about 1310 and was trained in medicine at the Sorbonne in Paris, becoming physician to Pope Clement V. In the book Rosarium Philosophorum he describes red sulfur or ‘sulfu… Grey allotropic form of seleni… Selenium is also used as an additive to make stainless steel. A measure of how difficult it is to deform a material. Production. Common chemical compounds are also provided for many elements. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Product #: gm466770373 $ 33.00 iStock In stock A vertical column in the periodic table. Comprehensive data on the chemical element Selenium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Selenium. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Selenium. Extra videos -- Our YouTube Channel -- Sixty Symbols (physics) -- Numberphile (maths) -- Facebook -- Twitter -- Email Where more than one isotope exists, the value given is the abundance weighted average. Selenium lies beneath sulfurin Group 16 of the periodic table. Periodic Table of Elements Element Selenium - Se. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. A relationship between the first three members of the group was recognized as early as Atomic Weight: 78.96. He became intrigued by ore from a mine near Zalatna which had a metallic sheen and which he suspected was native antimony or bismuth. The higher the value, the larger risk there is to supply. It is possible selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova. 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 temperature at which the liquid–gas phase change occurs. Interactive periodic table with up-to-date element property data collected from authoritative sources. Next week we're visiting the element that Superman made famous. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Copyright of and ownership in the Images reside with Murray Robertson. To find out more, see our, “Lettre de M. Berzelius à M. Berthollet sur deux métaux nouveaux”, “Dietary Supplement Fact Sheet: Selenium”. Selenium is a chemical element in the periodic table that has the symbol Se and atomic number 34. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Large amount of selenium dioxide is used in the smelting and refining of various metals from their ores, especially manganese. Where more than one isotope exists, the value given is the abundance weighted average. Most of these seem to indicate that if it is effective at all, it works somehow in conjunction with vitamin E, which, like selenium, plays an antioxidant role in the body. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. The number of atoms of the element per 1 million atoms of the Earth’s crust. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. Data for this section been provided by the. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. Periodic Table of Elements Selenium was discovered by Swedish chemists J�ns Jacob Berzelius and Johan Gottlieb Gahn in 1817 after analyzing an red precipitate that was contaminating the sulfuric acid (H2SO4) being produced at a chemistry plant in Sweden. Compare Arsenic vs Selenium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Selenium: Symbol: Se: Atomic Number: 34: Atomic Weight: 78.971: Density: 4.819 g/cm 3: Melting Point: 221 °C: Boiling Point: 685 °C: Thermal properties: Phase: Solid: Melting Point: 221 °C: Boiling Point: … Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. Boiling point Political stability of top reserve holder. He had shares in a sulfuric acid works and he was intrigued by a red-brown sediment which collected at the bottom of the chambers in which the acid was made. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. This WebElements periodic table page contains diselenium hexasulphide for the element selenium Atomic radius, non-bonded It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. A measure of the propensity of a substance to evaporate. There are various allotropic forms of selenium, that interconvert into each other with varying temperature. Oxygen group element, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). Selenium exists in only trace amounts around us. You may browse, download or print out one copy of the material displayed on the Site for your personal, non-commercial, non-public use, but you must retain all copyright and other proprietary notices contained on the materials. Selenium exists in an amorphous powder form in chemical reactions. Selenium gets its name from the Greek word "selene," which means "moon." Members of a group typically have similar properties and electron configurations in their outer shell. Selenium is an essential trace element for some species, including humans. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. red selenium has here sub-forms, alpha, beta and gamma. We hope that you enjoy your visit to this Site. You may not further copy, alter, distribute or otherwise use any of the materials from this Site without the advance, written consent of the RSC. It is combined with the physical properties of elements like tellurium and sulfur. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Again, this requires great care. The chemical symbol for Selenium is Se. Period. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. The role of the element in humans, animals and plants. Medium = substitution is possible but there may be an economic and/or performance impact, Low = substitution is possible with little or no economic and/or performance impact, If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department. A short film about the chemistry of Selenium, presented by The Periodic Table of Videos. The arrangements of electrons above the last (closed shell) noble gas. Each allotrope has different physical properties. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). The percentage of the world reserves located in the country with the largest reserves. The atomic number of each element increases by one, reading from left to right. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. CAS number It is given by the ratio of the pressure on a body to the fractional decrease in volume. 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. Density is the mass of a substance that would fill 1 cm. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. This is approximately the sum of the number of protons and neutrons in the nucleus. Elements are organised into blocks by the orbital type in which the outer electrons are found. Text © The Royal Society of Chemistry 1999-2011 The temperature at which the liquid–gas phase change occurs. This is approximately the sum of the number of protons and neutrons in the nucleus. Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. Members of a group typically have similar properties and electron configurations in their outer shell. 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 element symbol of selenium is Se. Interactive periodic table showing names, electrons, and oxidation states. You do not have JavaScript enabled. In fact a little investigation showed me that it was perfectly safe in small amounts. It can convert AC electricity to DC electricity. Yum! In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. Some compounds of organ selenium are used in the vulcanization process involved in the production of rubber and latex. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. 116. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. So much for trying to do a "wikipedia" search for this "hidden" element! But it's not all bad news. The biggest use of selenium is as an additive to glass. Selenium is widely used as a semiconductor. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game! It is used to make photocells. The sum of the oxidation states within a compound or ion must equal the overall charge. A vertical column in the periodic table. 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. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Some elements exist in several different structural forms, called allotropes. 400 micrograms per day is set as the safe upper intake level in humans. You're listening to Chemistry in its element brought to you by. Group 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. 34. Discovery: Jöns Jakob Berzelius and Johan Gottlieb Gahn (Sweden) Electron Configuration: [Ar] 4s 2 3d 10 4p 4. Tour of the name comes from the solid to the gas phase without passing through a liquid.! Information on the Visual elements licence agreement, tailored to the fractional decrease in volume and! 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And refining of copper typical selenium periodic table number and coordination publish and further license the Images reside with murray is... Vulcanization process involved in the Earth ’ s elemental - the Periodic Table is with!
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