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. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, silver, or lead. In fact a little investigation showed me that it was perfectly safe in small amounts. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. In a neutral atom there are as many electrons as protons moving about nucleus. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. This is where the artist explains his interpretation of the element and the science behind the picture. The nucleus consists of 34 protons (red) and 45 neutrons (orange). Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. 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. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Boiling point Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Period Number: 4. Too little selenium can cause health problems, but too much is also dangerous. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Selenium is a chemical element with symbol Se and atomic number 34. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Images © Murray Robertson 1999-2011 It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 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. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Selenium chemical element. Tellurium is chemically related to selenium and sulfur. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. The bulk properties of astatine are not known with any certainty. 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. 113Cd has specific absorption cross-section. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. The chemical symbol for Beryllium is Be. Selenium (Se). The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. It is located in Group 16 of the periodic table. It is both naturally occurring and produced by fission. Selenium is known to have over 20 different isotopes; however, only 5 of them are stable. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. 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. 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. Selenium (Se). You do not have JavaScript enabled. 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. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. 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. The chemical symbol for Fermium is Fm. It occurs on Earth as the decay product of various heavier elements. The percentage of a commodity which is recycled. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The chemical symbol for Bismuth is Bi. The chemical symbol for Iridium is Ir. 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. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Uranium is a silvery-white metal in the actinide series of the periodic table. Holmium is a relatively soft and malleable silvery-white metal. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Some elements exist in several different structural forms, called allotropes. Number of protons in Selenium is 34. It is toxic in high amount but is an essential micronutrient for all living things. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. It is given by the ratio of the shear stress to the shear strain. The chemical symbol for Ytterbium is Yb. Se is a non-metal. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. A vertical column in the periodic table. The chemical symbol for Rhodium is Rh. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. 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 chemical symbol for Iron is Fe. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. The chemical symbol for Selenium is Se . Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. Caesium has physical and chemical properties similar to those of rubidium and potassium. The chemical symbol for Zirconium is Zr. Selenium is not commonly found in its free or elemental form. 34 electrons (white) successively occupy available electron shells (rings). The chemical symbol for Holmium is Ho. 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. High = substitution not possible or very difficult. Tungsten is an intrinsically brittle and hard material, making it difficult to work. 34. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 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. It is defined as being the charge that an atom would have if all bonds were ionic. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. Atomic Weight = 78.96. 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 chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Its chemical symbol is Se and its atomic number is 34. The origin of the name comes from the Greek word selene meaning moon. Its primary use is in alloys and in glass production. 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 chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. For more information on the Visual Elements image see the Uses and properties section below. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. It is indicated by the symbol Se and the atomic number of selenium is 34. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Arsenic is a metalloid. Selenium is also used as an additive to make stainless steel. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Lawrencium is the final member of the actinide series. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. Chemical element of periodic table. Europium is one of the least abundant elements in the universe. Murray Robertson is the artist behind the images which make up Visual Elements. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Selenium. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. The energy released when an electron is added to the neutral atom and a negative ion is formed. Used in exp. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Block The chemical symbol for Berkelium is Bk. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. The chemical symbol for Lutetium is Lu. Although neodymium is classed as a rare earth, it is a fairly common element. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The chemical symbol for Californium is Cf. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). 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 We assume no responsibility for consequences which may arise from the use of information from this website. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Selenium 74 Metal (Selenium-74) is a stable (non-radioactive) isotope of Selenium. The minimum energy required to remove an electron from a neutral atom in its ground state. Nickel belongs to the transition metals and is hard and ductile. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Some selenium compounds decolourise glass, while others give a deep red colour. Each entry has a full citation identifying its source. This is approximately the sum of the number of protons and neutrons in the nucleus. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. The mass of an atom relative to that of carbon-12. Although it is uncommonly found, selenium does exist in relatively pure form, free in nature. The chemical symbol for Mercury is Hg. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Atomic number 34, Dioxyde de Sélénium, Ebselen, L-Selenomethionine, L-Sélénométhionine, Levure Sélénisée, Numéro Atomique 34, Se, Selenio, Selenite, Sélénite de Sodium, Sélénium, Selenium Ascorbate, Selenium Dioxide, Selenized Yeast, Selenomethionine, Sélénométhionine, Sodium Selenite. 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. 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 chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Isotopes But it's not all bad news. Selenium is a metalloid with atomic number 34 (discovered in 1817 by J. J. Berzelius) that has been demonstrated to be essential for living organisms. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Tellurium is far more common in the universe as a whole than on Earth. Relative atomic mass Atomic weight of Selenium is 78.971 u or g/mol. 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 chemical symbol for Boron is B. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. The chemical symbol for Einsteinium is Es. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. The configuration of these electrons follows from the principles of quantum mechanics. 34 2) Write the full electron configuration for selenium following the (n+l) rule? It is even less abundant than the so-called rare earths. 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. A vertical column in the periodic table. The chemical symbol for Calcium is Ca. 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 is a non-metallic element that carries the chemical atomic number 34. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Low = substitution is possible with little or no economic and/or performance impact. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 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. We use cookies to ensure that we give you the best experience on our website. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Sign with atomic number and atomic weight. 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 Platinum is Pt. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Electron configuration 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. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. The chemical symbol for Selenium is Se . A measure of how difficult it is to deform a material. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. The chemical symbol for Chromium is Cr. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. It was first observed by the Swedish scientist Jons Jacob Berzelius. The chemical symbol for … Radon is a radioactive, colorless, odorless, tasteless noble gas. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34. Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of selenium-79 (atomic number: 34), an isotope of this element. The chemical symbol for Caesium is Cs. Uncombined elements have an oxidation state of 0. It is located in Group 16 of the periodic table. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Radon is Rn. The arrangements of electrons above the last (closed shell) noble gas. But I save the best occurrence of selenium in nature for last. The element occurs in copper ores and rare minerals … Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Selenium definition, a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. The chemical symbol for Tin is Sn. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Its boiling point is the lowest among all the elements. (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. Thorium is moderately hard, malleable, and has a high melting point. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Titanium can be used in surface condensers. Thulium is the thirteenth and third-last element in the lanthanide series. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … The name is derived from 'selene', the Greek name for the Moon. The chemical symbol for Praseodymium is Pr. 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. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. 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. The chemical symbol for Lithium is Li. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Selenium is located at position 34 on the periodic table. From: Analytica Chimica Acta, 2013 Related terms: Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. The chemical symbol for Francium is Fr. Atoms of the same element with different numbers of neutrons. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. It is also used as a catalyst in some chemical processes. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. Selenium (selenium atoms only) has several different forms. It is given by the ratio of the pressure on a body to the fractional decrease in volume. The chemical symbol for Arsenic is As. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. Text © The Royal Society of Chemistry 1999-2011 Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Atomic Symbol. Uranium has the highest atomic weight of the primordially occurring elements. Selenium is a metallic gray chemical element with an atomic number of 34. It has been widely used in electronic devices. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. 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 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. Some elements exist in several different structural forms, called allotropes. Selenium Overview . Elements are organised into blocks by the orbital type in which the outer electrons are found. is a rare earth element with a metallic silver luster. It has 34 protons and 34 electrons and a mass number of 78.96. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Element Classification: Non-metal. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Selenium, Se, atomic number 34. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. Atomic Number – Does it conserve in a nuclear reaction? Period. 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. It is one of the least reactive chemical elements and is solid under standard conditions. The atomic number of each element increases by one, reading from left to right. it exists in the form of ores and minerals. 1) What is the atomic # for selenium? The nucleus consists of 34 protons (red) and 46 neutrons (blue). The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. It is a soft, silvery-white alkali metal. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. The chemical symbol for Actinium is Ac. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Members of a group typically have similar properties and electron configurations in their outer shell. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). The chemical symbol for Neodymium is Nd. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. Data for this section been provided by the. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. So much for trying to do a "wikipedia" search for this "hidden" element! A freshly exposed surface of pure copper has a reddish-orange color. Ok so I'll take you through some interesting facts and data about Selenium (That most people don't know). 6 what is the number of core electrons? The chemical symbol for Silicon is Si. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Phase at Room Temperature: Solid. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). The image is of a crescent moon against a cratered surface. It is indicated by the symbol Se and the atomic number of selenium is 34. Selenium is a chemical element. All of its isotopes are radioactive. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. and Gay-Lussac, L.-J. Selenium Description. Trivial name of Selenium is chalcogens*. Selenium burns in air and is toxic by inhalation or ingestion. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. It is occasionally found in native form as elemental crystals. Sign with atomic number and atomic weight. 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. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. The chemical symbol for Erbium is Er. Selenium is a chemical element. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Gold is a transition metal and a group 11 element. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Carbon is one of the few elements known since antiquity. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. 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 chemical symbol for Lawrencium is Lr. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. The chemical symbol for Hafnium is Hf. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. The atomic number is the number of protons in the nucleus of an atom. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. The chemical symbol for Dysprosium is Dy. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Its electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 4 or it can be written as [Ar] 3d 10 4s 2 4p 4. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. The RSC maintains this Site for your information, education, communication, and personal entertainment. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Chemical element of periodic table. 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. 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. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Sélenium — Sélénium Sélénium Arsenic … Wikipédia en Français Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 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. Krypton is a member of group 18 (noble gases) elements. Classified as a nonmetal, Selenium is a solid at room temperature. 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. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. The chemical symbol for Astatine is At. Selenium is an essential trace element for some species, including humans. Einsteinium is the seventh transuranic element, and an actinide. 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. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. 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. 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. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. The chemical symbol for Sodium is Na.

selenium atomic number

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