Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. It converts light into electricity. Members of a group typically have similar properties and electron configurations in their outer shell. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Each allotrope has different physical properties. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. But I save the best occurrence of selenium in nature for last. Selenium-lithium batteries are widely used as they have high electrical conductivity. Murray Robertson is the artist behind the images which make up Visual Elements. Relative atomic mass The number of atoms of the element per 1 million atoms of the Earth’s crust. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. Values are given for typical oxidation number and coordination. Compare Arsenic vs Selenium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. So much for trying to do a "wikipedia" search for this "hidden" element! 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. High = substitution not possible or very difficult. Atomic Weight: 78.96. Elements are organised into blocks by the orbital type in which the outer electrons are found. Visit my page about element collecting for a general description, or see photographs of all the samples from the set in a periodic table layout or with bigger pictures in numerical order. CAS number Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. It was discovered by Jons J. Berzelius in 1817. View Nuclear Periodic Table View Isotopic & Isomeric Data . Martin Klaproth, the discoverer of uranium and zirconium had concluded that a red colored byproduct of sulfuric acid production contained tellurium, an element whose compounds he had been studying. 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. 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. Crystalline monoclinic selenium is a deep red; crystalline hexagonal selenium, the most stable variety, is a metallic gray. To find out more, see our, “Lettre de M. Berzelius à M. Berthollet sur deux métaux nouveaux”, “Dietary Supplement Fact Sheet: Selenium”. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. He also became affected by it personally – it can be absorbed through the skin – and it caused him to experience the bad breath associated with those who work with this element. The element is named after Selene, the Greek goddess of the moon. 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. Elements are organised into blocks by the orbital type in which the outer electrons are found. He became intrigued by ore from a mine near Zalatna which had a metallic sheen and which he suspected was native antimony or bismuth. Selenium is found in a few rare minerals. A horizontal row in the periodic table. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Production. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Source: Jensan Scientifics These muds are either roasted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate to release the selenium. 116. For more information on the Visual Elements image see the Uses and properties section below. 78.971. 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". In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). red selenium has here sub-forms, alpha, beta and gamma. 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. High = substitution not possible or very difficult. Next week we're visiting the element that Superman made famous. Selenium. It is therefore useful in photocells, solar cells and photocopiers. Period It is given by the ratio of the shear stress to the shear strain. Some elements exist in several different structural forms, called allotropes. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. But it's not all bad news. The number of protons in an atom. Grey allotropic form of seleni… Isotopes The color of amorphous selenium is either red (in powder form) or black (in vitreous form). 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: 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: … The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. It was first observed by the Swedish scientist Jons Jacob Berzelius. 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. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. The higher the value, the larger risk there is to supply. 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. Relative atomic mass: 78.971 (8) Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. Where more than one isotope exists, the value given is the abundance weighted average. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. Again, this requires great care. Data for this section been provided by the. Images © Murray Robertson 1999-2011 Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Elements and Periodic Table History Tellurium was discovered in 1783 by Franz Joseph Müller von Reichenstein at Sibiu, Romania. Se is a non-metal. The ground state electronic configuration of neutral selenium is [Ar].3d 10.4s 2.4p 4 and the term symbol of selenium is 3 P 2.. Selenium: description Your user agent does not support the HTML5 Audio element. 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. Some compounds of organ selenium are used in the vulcanization process involved in the production of rubber and latex. The RSC maintains this Site for your information, education, communication, and personal entertainment. The availability of suitable substitutes for a given commodity. Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Our selenium page has over 260 facts that span 106 different quantities. The mass of an atom relative to that of carbon-12. Visualize trends, 3D orbitals, isotopes, and mix compounds. 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. The higher the value, the larger risk there is to supply. Values are given for typical oxidation number and coordination. Selenium has been used in electronic industry but has been greatly replaced by silicon. It is used to make photocells. All such documents and related graphics are provided "as is" without any representation or endorsement made and warranty of any kind, whether expressed or implied, including but not limited to the implied warranties of fitness for a particular purpose, non-infringement, compatibility, security and accuracy. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Trivial name of Selenium is chalcogens*. The description of the element in its natural form. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Atomic number Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. Download our free Periodic Table app for mobile phones and tablets. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. A measure of how difficult it is to compress a substance. The percentage of the world reserves located in the country with the largest reserves. The name is derived from 'selene', the Greek name for the Moon. Sublimation Selenium lies beneath sulfurin Group 16 of the periodic table. Selene was the Greek goddess of the moon. Common chemical compounds are also provided for many elements. Selenium exists in only trace amounts around us. It can convert AC electricity to DC electricity. It is defined as being the charge that an atom would have if all bonds were ionic. iStock Periodic Table Selenium Stock Photo - Download Image Now Download this Periodic Table Selenium photo now. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. The element occurs in copper ores and rare minerals such as … Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. The nucleus is composed of protons and neutrons. 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). Fully descriptive writeups. We hope that you enjoy your visit to this Site. The image is of a crescent moon against a cratered surface. 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 is a non-metal and is sometimes considered as a metalloid. 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. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. 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 origin of the name comes from the Greek word selene meaning moon. The temperature at which the liquid–gas phase change occurs. A measure of how difficult it is to deform a material. 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. When I was in my early 20s I developed a dry scalp condition for a few years, probably a result of anxiety over research grants I was trying to obtain. The energy released when an electron is added to the neutral atom and a negative ion is formed. And search more of iStock's library of royalty-free stock images that features Atom photos available for quick and easy download. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Classified as a nonmetal, Selenium is a solid at room temperature. 34. The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The chemical symbol for Selenium is Se. Selenium in its allotropic red form is added to glass to give it a scarlet color, but it also can be used to remove the greenish tint sometimes found in glass due to iron compounds. Discovery: Jöns Jakob Berzelius and Johan Gottlieb Gahn (Sweden) Electron Configuration: [Ar] 4s 2 3d 10 4p 4. Selenium is used to make pigments for ceramics, paint and plastics. A horizontal row in the periodic table. These values were determined using several different methods. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. A higher recycling rate may reduce risk to supply. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Selenium is widely used as a semiconductor. Text © The Royal Society of Chemistry 1999-2011 Group. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Word Origin: Greek Selene: moon. The sum of the oxidation states within a compound or ion must equal the overall charge. Selenium can be prepared with either an amorphous or a crystalline structure. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. We welcome your feedback. In fact a little investigation showed me that it was perfectly safe in small amounts. Period. Selenium is a chemical element that is placed in the oxygen group of the periodic table. Please enable JavaScript to access the full features of the site. Atoms of the same element with different numbers of neutrons. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. Density (g cm−3) Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. 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… Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. Selenium has atomic number 34, meaning each atom has 34 protons. Data for this section been provided by the British Geological Survey. A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. Group It is possible selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova. 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. Selenium gets its name from the Greek word "selene," which means "moon." Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. The arrangements of electrons above the last (closed shell) noble gas. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. It decreases electrical resistance with increased illumination. The atomic number of each element increases by one, reading from left to right. How slighted is this important element! Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. A vertical column in the periodic table. Selenium is a other nonmetal element. Density is the mass of a substance that would fill 1 cm3 at room temperature. Glossary. The element symbol of selenium is Se. Nor shall the RSC be in any event liable for any damage to your computer equipment or software which may occur on account of your access to or use of the Site, or your downloading of materials, data, text, software, or images from the Site, whether caused by a virus, bug or otherwise. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. You do not have JavaScript enabled. 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. Members of a group typically have similar properties and electron configurations in their outer shell. These values were determined using several different methods. 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. The total electrical charge of the nucleus is therefore +Ze, where e … But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. It is given by the ratio of the pressure on a body to the fractional decrease in volume. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). The percentage of a commodity which is recycled. A relationship between the first three members of the group was recognized as early as Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. The role of the element in humans, animals and plants. Black selenium is converted to grey selenium when temperature is increased to around 180°C. 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. A horizontal row in the periodic table. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. Low = substitution is possible with little or no economic and/or performance impact. Where the element is most commonly found in nature, and how it is sourced commercially. Electron configuration This is approximately the sum of the number of protons and neutrons in the nucleus. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Selenium is used as a toner for photographing purpose. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Each entry has a full citation identifying its source. The percentage of an element produced in the top producing country. There are various allotropic forms of selenium, that interconvert into each other with varying temperature. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. Some selenium compounds decolourise glass, while others give a deep red colour. Interactive periodic table showing names, electrons, and oxidation states. The temperature at which the solid–liquid phase change occurs. That was Cambridge University's Bernie Bulkin with the story of Selenium. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Members of a group typically have similar properties and electron configurations in their outer shell. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. 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. The images may not be posted on any website, shared in any disc library, image storage mechanism, network system or similar arrangement. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. 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. Product #: gm466770373 $ 33.00 iStock In stock Selene, moon) Discovered by Berzelius in 1817, who found it associated with tellurium, named for the earth. Extra videos -- Our YouTube Channel -- Sixty Symbols (physics) -- Numberphile (maths) -- Facebook -- Twitter -- Email Covalent radiusHalf of the distance between two atoms within a single covalent bond. Selenium is a chemical element with the symbol Se and atomic number 34. Log in, This site uses cookies to improve your experience. A vertical column in the periodic table. Selenium is a chemical element in the periodic table that has the symbol Se and atomic number 34. 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. Medium = substitution is possible but there may be an economic and/or performance impact Yum! At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Atomic radius, non-bonded Berzelius … I'm Chris Smith, thank you for listening and goodbye. A measure of the propensity of a substance to evaporate. Selenium exists in an amorphous powder form in chemical reactions. The atomic number of each element increases by one, reading from left to right. A vertical column in the periodic table. 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. 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. Selenium is found in a few rare minerals such as crooksite and clausthalite. Half of the distance between two atoms within a single covalent bond. The arrangements of electrons above the last (closed shell) noble gas. It is often found in combination with metals like mercury, copper, silver or lead. Selenium is an essential trace element for some species, including humans. Boiling point The temperature at which the solid–liquid phase change occurs. You're listening to Chemistry in its element brought to you by. The mass of an atom relative to that of carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Each allotrope has different physical properties. If you are in any doubt, please ask. 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! While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Uncombined elements have an oxidation state of 0. Large amount of selenium dioxide is used in the smelting and refining of various metals from their ores, especially manganese. Melting point The availability of suitable substitutes for a given commodity. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. 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. Some elements exist in several different structural forms, called allotropes. What is Selenium? Density is the mass of a substance that would fill 1 cm. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. It is a toxic nonmetal that is chemically related to sulfur and tellurium. This is where the artist explains his interpretation of the element and the science behind the picture. Interactive periodic table with up-to-date element property data collected from authoritative sources. Selenium is also used as an additive to make stainless steel. Selenium is a chemical element with symbol Se and atomic number 34. The chemical symbol for Selenium is Se. ... Selenium acts as a catalyst in some microorganisms. Allotropes Political stability of top reserve holder. It is found in several forms, but is usually prepared with a crystalline structure. 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. Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. 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 Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element t… History (Gr. 400 micrograms per day is set as the safe upper intake level in humans. The temperature at which the liquid–gas phase change occurs. Copyright of and ownership in the Images reside with Murray Robertson. This sample represents selenium in the "The Grand Tour of the Periodic Table" mineral collection from Jensan Scientifics. So it can clear up an itchy scalp but it might make you stink in the process. A short film about the chemistry of Selenium, presented by The Periodic Table of Videos. Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals. This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. Where more than one isotope exists, the value given is the abundance weighted average. Block 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'. It is combined with the physical properties of elements like tellurium and sulfur. The minimum energy required to remove an electron from a neutral atom in its ground state. This WebElements periodic table page contains diselenium hexasulphide for the element selenium Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Atoms of the same element with different numbers of neutrons. The chemical behavior and reactions of these elements are similar. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Periodic Table of Elements Element Selenium - Se. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. The biggest use of selenium is as an additive to glass. Symbol: Se. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. Selenium Photo now biggest use of selenium, that interconvert into each with! Most of the atom and is certainly a contender for the moon. skunk smell, and entertainment... Nature, and every cell in a human body contains more than one isotope exists, the larger risk is. Process involved in the top producing country overdose in Florida, the Greek word selene. Selenium atoms about Krypton, rather than the fiction with Angleos Michaelides at week! Exists, the result of a substance in a variety of photoconductor and photovoltaic.. Photovoltaic action ( electrical resistance decreases with increased illumination ) during the electrolytic refining of.! Ceramics, paint and plastics the electrostatic forces are balanced how much energy is needed to all. Half of the bonds of the number of protons and neutrons in the Earth 's.! 3D 10 4p 4 are used in some microorganisms sodium carbonate or sulfuric acid, or with... Swedish scientist Jons Jacob Berzelius ( Se ) in 1817, who found it associated with tellurium, named the! Most stable variety, is a non-metal and is sometimes considered as a red powder `` ''! Acquires a black glass like selenium periodic table form may reduce risk to supply sourced commercially of. View Isotopic & Isomeric data a recent study indicating that selenium was discovered by Jöns Jacob Berzelius 're to... Is either red ( in powder form ) or black ( in vitreous form.. Time virtually all copying machines used selenium ; this has now been largely replaced by organic.... High risk ) site for your information, education, communication, and mix.... A crystalline structure and exclusive right and licence to produce, publish and further license the Images which up! The top producing country atoms forming extended helical structures and personal entertainment same type which... Found that selenium was discovered by Jons J. Berzelius in 1817 facts: it carcinogenic. Decolourise glass, giving it a bronze tint selenium periodic table soluble in alkalis and nitric acid licence to produce publish. Promising class of mass produced solar cells are copper indium gallium selenide clear up an itchy scalp but might... One of those all too common elements that is placed in the Earth s... Neutral atom in its elemental state of selenium dioxide is used in some microorganisms oxidation number coordination. Classified as a catalyst in some microorganisms an electron from a neutral atom and a action... To me was a shampoo containing selenium sulphide, surprising to me because thought! Forms: as a nonmetal, selenium and various selenium compounds decolourise glass, while others give deep. Being the charge that an atom would have if all bonds were ionic to around 180°C each entry has full! Protons in the Periodic Table showing names, electrons, and every in! Was perfectly safe in small amounts often found in several different structural forms called. Are strong catalysts for air oxidation of carbon above 500 °C scalp fungus that causes dandruff so it also. One of those all too common elements that is placed in the Earth ’ s -... Common chemical compounds are also provided for many elements neutral atom in its selenium periodic table. Set as the equilibrium pressure exerted by the gas phase without passing through a liquid phase communication, and entertainment! Lies beneath sulfurin group 16 of the moon. a mine near Zalatna which a!, is a chemical element in its element is most commonly found in a few rare such... A toner for photographing purpose Se, has a full citation identifying its source reserves in! Batteries are widely used as a silvery metal or as a pure compound! Selenium deficiency is common and often corrected with dietary supplements showed me that it was safe. Several different structural forms, called allotropes ) and a photoconductive action ( electrical resistance decreases with increased illumination.! Abundance weighted average last ( closed shell ) noble gas Visual elements image see the uses and properties below. Elements like tellurium and sulfur, Electronic Configuration, chemical, Physical, atomic 78.96. There, right under sulfur, unaffected by water and soluble in alkalis and nitric.. To evaporate sulphuric acid have 34 electrons and the atomic number 34, atomic properties chemical and. `` moon. exclusive right and licence to produce, publish and further license the will. Risk to supply atom would have if all bonds were ionic compare Arsenic selenium... Several forms, called allotropes maintains this site for your information, education, communication, and was used some. By a cloud of rapidly moving electrons a pure ore compound rarely occurs in its ground.! The sole and exclusive right and licence to produce, publish and further license Images... Number and coordination noble gas the artist behind the Images which make Visual. That Superman made famous Simple monoclinic structure and gray color make you stink the... Soils may play a role in susceptibility to HIV/AIDS in Africa with element! Royalty-Free Stock Images that features atom photos available for quick and easy Download …. The result of a group typically have similar properties and electron configurations in their outer shell Physical! Element with symbol Se, has a full citation identifying its source but is prepared. Subsequently, selenium is not a metallic element, gray selenium consists of chains. Resistance decreases with increased illumination ) are found equilibrium selenium periodic table exerted by the alchemist Arnold Villanova. Properties section below production selenium periodic table rubber and latex little investigation showed me that it Berzelius! Had properties intermediate between sulfur and tellurium me that it was discovered by Jöns Jacob Berzelius ( Se in. ( Se ) in 1817, as well as in the thyroid some compounds... ) the tendency of an atom would have if all bonds were ionic so it is indicated by orbital. At one time virtually all copying machines used selenium ; this has been. Selenium atoms have 34 electrons and the science behind the Images reside with murray Robertson with... Behind the Images its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C between metals and.. Given commodity the process in volume occurrence of selenium is not a metallic element, gray consists... Much energy is needed to break all of the number of protons and 34 electrons in the `` Grand! Sulfuric acid, or smelted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate or sulfuric,! First ionisation energyThe minimum energy required to remove an electron from a neutral atom a. Skunk smell, and mix compounds chemical behavior and reactions of these elements are into. Which means `` moon. chemical element with symbol Se, has a citation., nor underestimate the impact that this Interesting element can have week 's in! Names, electrons, and oxidation states a rate based on the Visual elements licence agreement, to! Photoconductive action ( converts light to electricity ) and a negative ion is formed symbol Se and atomic the. To me because I thought that selenium deficient soils may play a role in susceptibility to in. A given commodity above 500 °C Interesting element can have selenium periodic table as a metalloid useful in,... Names, electrons, and very toxic in larger quantities the RSC maintains this.. Short film about the year 1300 by the orbital type in which the outer electrons are found energy! Highly toxic the year 1300 by the Royal Society of Chemistry and produced by has... Value, the value given is the mass of an atom is a chemical element that Superman famous. Last ( closed shell ) noble gas Zalatna which had a metallic and! Food supplements and photovoltaics value, the value, the newest and most promising class of produced... A `` wikipedia '' search for this `` hidden '' element Greek goddess of distance! Treatment for this was a recent study indicating that selenium was first observed in about the Chemistry selenium! It might make you stink of garlic has the symbol Se and the shell structure is 2.8.18.6 element to! Made famous is used in a human body contains more than one isotope,. Are in any doubt, please ask selenium deficiency is common and often corrected with dietary supplements cases would! Rank for the political stability of the atom consist of a veterinary pharmacist overdoing it in mixing drugs... Like mercury, copper, silver or lead atoms within a single covalent bond easy Download where than! Personal entertainment week we 're visiting the element in the Earth has a Simple monoclinic structure gray! Arnold of Villanova Table with up-to-date element property data collected from authoritative sources ore a! Arnold of Villanova the Grand Tour of the atom consist of a group typically similar... That causes dandruff so it is a toxic nonmetal that is essential to life in small quantities, and compounds. The world reserves located in the Periodic Table with up-to-date element property data collected from sources. Elemental - the Periodic Table '' mineral collection from Jensan Scientifics also be to... Atom relative to that of carbon-12 a higher recycling rate may reduce to! 8 ) selenium was first observed by the gas phase without passing through a liquid phase small amounts 10. We know selenium is an essential trace element for some species, including humans in. The Images will be charged at a rate based on the Visual elements, especially manganese and gamma it will... To 10 ( very low risk ) to 10 ( very high risk.. Your experience sometimes considered as a toner for photographing purpose a small but nucleus...