Dates: Modify . 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. Relative atomic mass The name is derived from 'selene', the Greek name for the Moon. 2005-08-08. Atoms of the same element with different numbers of neutrons. The higher the value, the larger risk there is to supply. 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]. – kaufen Sie diese Vektorgrafik und finden Sie ähnliche Vektorgrafiken auf Adobe Stock Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. The number of atoms of the element per 1 million atoms of the Earth’s crust. The boiling point of selenium is 957.8 degrees Kelvin or 685.65 degrees Celsius or degrees Celsius. The availability of suitable substitutes for a given commodity. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. It is a micronutrient. Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. Selenium chemical element. The percentage of an element produced in the top producing country. Selenium, isotope of mass 75. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Data for this section been provided by the. Members of the oxygen family, can combine with most other groups or families on the periodic table, except for inert gases. Atomic Number-34 Atomic Mass-78.96 Group Number-16 Selenium's group number 16, is called the chalcogens, or the oxygen family. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Se is a non-metal. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. Classified as a nonmetal, Selenium is a solid at room temperature. Both sulfur and arsenic have some healing properties, and since neighbors in the periodic table have similar properties, it is not surprising that selenium seems to influence human health. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. 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. 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. It has been widely used in electronic devices. Where more than one isotope exists, the value given is the abundance weighted average. Images © Murray Robertson 1999-2011 But what is an "Atomic Number"? 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. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. The atomic number of selenium is 34. Period Number: 4. https://www.nuclear-power.net/Selenium-atomic-number-mass-density Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. The element occurs in copper ores and rare minerals such as clausthalite, crooksite, and eucairite. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Periodic Table of the. Too little selenium can cause health problems, but too much is also dangerous. 96}, author={D. T. Win} } D. T. Win; Selenium, a trace element, is an antioxidant and is an essential component for normal functioning of the immune system and thyroid gland. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. 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. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. Illustration about molecule, concept - 151780509 Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. Selenium was discovered by John Gottleib Gahn and Jons Jacob Berzelius in 1817. A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Properties Physical properties. Know everything about Selenium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure. Selenium (Se). The colour ranges from grey metallic to red glassy. Group Name: Chalcogen. 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. Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure 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. Our selenium page has over 260 facts that span 106 different quantities. Density is the mass of a substance that would fill 1 cm. Selenium is a chemical element with symbol Se and atomic number 34. 1 Structures Expand this section. It is given by the ratio of the shear stress to the shear strain. 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