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They are called allotropes.The most stable of these is a dense gray semimetal (an element that is partially a metal and a nonmetal).The way the atoms are put together is a named a trigonal polymer chain.It lets electricity pass through it better in the light than in the dark. Find here Selenium Metal, Se Metal manufacturers, suppliers & exporters in India. Read about company. Marcin. Selenium has antioxidant properties and may help protect cells from damage. This is a question i'm stuck on in my science h/w. Still have questions? it says, "Suggest wheather selenium is a metal or a non-metal", which i can answer Non-metal, Then.. "Explain your Decision" And i'm stuck there becuase all i did was look on wiki pedia and sore its a non-metel but i dont know why it is????? The role of selenium in health was first recognized as a toxic one, by the recognition of its adverse effects. Selenium toxicity is generally not a widespread threat to humans. Is Selenium A Metal. The amount of selenium in food depends on the selenium concentration of the soil, and this can vary both regionally and internationally ().Sadly, selenium deficiency is a growing problem, and estimates put the global number of selenium-deficient people at one billion (2, 3). Which of the following lists the elements in probable order from least malleable to … This is especially important for reducing cancer growth and improving the aging process (10, 11, 12). This native selenium is exactly as it came out of the ground. It’s a strange mineral because it is almost never found in its natural form. Selenium can come in … Selenium is an essential micronutrient in mammals, but is also recognized as toxic in excess. It shows borderline metalloid or nonmetal behaviour. Humans mainly acquire it from various plant sources, and since it is required for several essential activities, it is considered a non-metal. The limits are aimed at stemming selenium leaching from coal mines along British Columbia’s Elk River. ... Selenium has the characteristics of non-metals and metals evenly divided, being a metalloid or semi-metal. Montana Board of Environmental Review Chair Chris Deveny says the proposed regulations were approved in a five to one vote. The term has particular application to cadmium, mercury and lead, all of which appear in the World Health Organization's list of 10 chemicals of major public concern. For lithium‐selenium batteries, commercial applications are hindered by the inferior electrical conductivity of selenium and the low utilization ratio of the active selenium. 0 0. shaheen. Selenium occurs in (fairly) pure form in nature. But magnesium is a metal, the lightest of all metals actually. Bismuth / Selenium / Tellurium top stories more... Data: SHFE, DCE market movement (Nov 13) ... Social inventories of silicon metal across Huangpu port, Kunming city and Tianjin port remained unchanged from the previous week at 71,000 mt as … Imports of selenium (includes unwrought metal, waste and scrap, and compounds) 412 Exports of selenium (includes unwrought metal and waste and scrap) 160 Fabrication Processing losses Selenium products to U.S. market 350 New prompt scrap generated <½ Domestic production of selenium materials W Old scrap generated Old scrap supply Received December 20, 1983 Among the activities of the essential trace element selenium is the ability to reduce the toxicity of heavy metal … The Agency for Toxic Substances and Disease Registry assigned selenium a “minimal” risk level. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. 9 years ago. Trending Questions. Selenium is a non-metal and can be compared chemically to its other non-metal … This process helps to reduce and repair damaged cell DNA. Coincidentally, research on trace elements and antioxidants has shown that these elements, and in particular selenium, are of great importance for the optimum functioning of the immune system and the body's resistance to heavy metal pollution. Properties Physical properties. Silicon rectifiers eventually took over this title.. Selenium rectifiers can be used for electronic devices, such as photocopiers. At room temperature selenium is a solid, but not a metal. Often, it’s found in metal sulfite ores (fancy word for rocks that have high amounts of extractable minerals), which often replaces sulphur. Join Yahoo Answers and get 100 points today. Get your answers by asking now. Selenium (Se) is a nonmetal, germanium (Ge) is a metalloid, and silver (Ag) is a metal.? It is used in many light-sensing applications: photocopiers, automatic light switches and light meters. Its bonds are more covalent in nature and its structure is more spread out than in metallic minerals such as copper and iron. If it wasn’t clear in the intro, selenium is a mineral. Thus, selenium is usually counted as a nonmetal. A selenium rectifier is a type of rectifier that uses selenium, a chemical element that is not a metal, as a semiconductor for electrical conductivity. Selenium is also very important for healthy fertility. Selenium is important if you take a cholesterol medication, and I’ll get to that shortly. Here, we report a new baked‐in‐salt approach to enable Se to better infiltrate into metal‐complex‐derived porous carbon (Se/MnMC‐B). Inorganica Chimica Acta, 92 (1984) 187-189 Selenium Detoxification of Heavy Metals: a Possible Mechanism for the Blood Plasma KERN L. NUTTALL and FRITZ S. ALLEN* Department of Chemistry, University of New Mexico, Albuquerque, N.M. 87131, U.SA. Although selenium has a metallic luster, it is not metallic in crystal structure or bonding characteristics. Selenium Metal is available as disc, granules, ingot, pellets, pieces, powder, rod, wire, and sputtering target. Sources: Selenium occurs in the minerals crooksite and clausthalite. In fact, selenium deficiency is far more common than selenium toxicity. Selenium was first discovered by Jöns Jacob Berzelius in 1817. Tellurium is more metallic in nature than selenium but is still a semi-metal. To date, there are no reports about metal–organic frameworks (MOFs) to use for Na–Se batteries. The substitution of Se for S as cathode for rechargeable batteries, which confine selenium in porous carbon, attracts much attention as a potential area of research for energy storage systems. Although toxic in large quantities, it is necessary for certain cellular functions of animals and people. 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