selenium(2-) 22541-48-6. selanediide. In high concentrations, selenium acts as an environmental contaminant. Selenium poisoning can be passed from parents to offspring through the egg, and selenium poisoning may persist for many generations. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. It is prepared by treating selenium with sulfuryl chloride (SO2Cl2). Eidon Ionic Minerals Liquid Selenium. UNII-8O54YXR180. Much below that level, young salmon die from deficiency; much above, they die from toxic excess. Consistent with trends indicated by the double bond rule, selenoketones, R(C=Se)R, and selenaldehydes, R(C=Se)H, are rarely observed. , 75Se is used as a gamma source in industrial radiography.. With highly electropositive metals, such as aluminium, these selenides are prone to hydrolysis:.  It can be synthesized by the reaction of selenium tetrachloride (SeCl4) with [((CH3)3Si)2N]2Se. Selenium intensifies and extends the tonal range of black-and-white photographic images and improves the permanence of prints. A few of these appeared more recently, in the last 50–200 million years, in fruits and flowers of angiosperm plants. Molecular Formula. , Industrial production of selenium usually involves the extraction of selenium dioxide from residues obtained during the purification of copper. Applications in electronics, once important, have been mostly replaced with silicon semiconductor devices. ions, formula = Deiodinases are able to extract electrons from iodides, and iodides from iodothyronines. Extreme cases of selenosis can exhibit cirrhosis of the liver, pulmonary edema, or death. Reproduction of mallard ducks is impaired at dietary concentrations of 7 ug Se/L. Iodides of selenium are not well known. uses its best efforts to deliver a high quality copy of the Selenium was later confirmed to be the toxic factor. Phytoplankton can concentrate inorganic selenium by a factor of 3000. errors or omissions in the Database. a. Fe^3+  These detectors use amorphous selenium to capture and convert incident x-ray photons directly into electric charge..  These lasted in commercial applications until the 1970s, following which they were replaced with less expensive and even more efficient silicon rectifiers. Selenium is bioaccumulated in aquatic habitats, this results in higher concentrations in organisms than the surrounding water.  It was discovered to be essential for mammalian life in 1957. Anwar Hossain, Ken Touhata, Takeshi Yabu, and Yumiko Yamashita, CS1 maint: multiple names: authors list (. Find Similar Structures. This color cancels out the green or yellow tints that arise from iron impurities typical for most glass.  Neonate ruminants at risk of white muscle disease may be administered both selenium and vitamin E by injection; some of the WMD myopathies respond only to selenium, some only to vitamin E, and some to either. Michiaki Yamashita, Shintaro Imamura, Md. Illustrative selenides include mercury selenide (HgSe), lead selenide (PbSe), zinc selenide (ZnSe), and copper indium gallium diselenide (Cu(Ga,In)Se2). Part B rubidium and selenium Express your answers as ions and chemical formula separated by a commas.  It has also been suggested that season could have an impact on the harmful effects of selenium on fish. , During the electrowinning of manganese, the addition of selenium dioxide decreases the power necessary to operate the electrolysis cells. , Selenium reacts with cyanides to yield selenocyanates:, Selenium, especially in the II oxidation state, forms stable bonds to carbon, which are structurally analogous to the corresponding organosulfur compounds. , It has been suggested that selenium supplementation may help prevent cancer incidence in people, but research has established there is no evidence to support such claims. However, it can damage plants at higher doses. National Institute of Standards and , The deiodinase isoenzymes constitute another family of eukaryotic selenoproteins with identified enzyme function. However, NIST makes no warranties to that effect, and NIST Q27109021. For the software testing framework, see. selenium, vanadium, magnesium, copper, and zinc, may have been lacking in some terrestrial mineral-deficient areas. Gray Se is formed by mild heating of other allotropes, by slow cooling of molten Se, or by condensing Se vapor just below the melting point. The recoding mechanism was worked out first in bacteria and then in mammals (see SECIS element).. Therefore the formula for selenium monoxide is SeO. Also, people dependent on food grown from selenium-deficient soil are at risk. 1. name the ions formed by the following elements a. selenium b. barium c. phosphorus d. iodine. , Selenium poisoning of water systems may result whenever new agricultural runoff courses through normally dry, undeveloped lands. Se(2-) A816696. Copper has two common ion charges, Cu+ and Cu2+. It has 34 protons and 34 electrons and a mass number of 78.96. Tetraselenium tetranitride, Se4N4, is an explosive orange compound analogous to tetrasulfur tetranitride (S4N4). , In the regions (e.g. Selenium occurs naturally in a number of inorganic forms, including selenide, selenate, and selenite, but these minerals are rare. Vandevraye, M.; Drag, C.; Blondel, C.,  With so many humans consuming fish as a source of protein, it is important to be aware of the selenium pollution occurring in the oceans they get their fish from so we know what we are putting in our bodies. In June 2015, the US Food and Drug Administration (FDA) published its final rule establishing the requirement of minimum and maximum levels of selenium in infant formula. Especially common are selenides (R2Se, analogues of thioethers), diselenides (R2Se2, analogues of disulfides), and selenols (RSeH, analogues of thiols). In 1873, Willoughby Smith found that the electrical resistance of grey selenium was dependent on the ambient light. Synonyms. 16. Selenium does not exhibit the changes in viscosity that sulfur undergoes when gradually heated. Respiratory capacity is further reduced due to selenium binding to hemoglobin.  See more on plant nutrition below. Though once widely used, selenium rectifiers have mostly been replaced (or are being replaced) by silicon-based devices. The chemistry of the selenides and sulfides is similar. In fact, the angiosperms (the dominant type of plant today) and most of their antioxidant pigments evolved during the late Jurassic period. (b) The electron distribution of a selenium atom is 2 + 8 + 18 + 6. In Belews Lake North Carolina, 19 species of fish were eliminated from the lake due to 150-200 μg Se/L wastewater discharged from 1974 to 1986 from a Duke Energy coal-fired power plant. you should know periodic table, Selenium on 6A grup. Selenium is used to treat or prevent selenium deficiency. Selenium has been used in alternative medicine as an aid to treat Hashimoto's thyroiditis (an autoimmune disorder of the thyroid), and to treat high cholesterol. The demand for selenium by the electronics industry is declining. , Researchers found that application of selenium fertilizer to lettuce crops decreased the accumulation of lead and cadmium. off-white (1) ... Selenium tetrachloride. In solution it is a diprotic acid: H 2 SeO 3 ⇌ H + + HSeO − 3 (pK a = 2.62) HSeO − 3 ⇌ H + + SeO 2− 3 (pK a = 8.32) Selenium is found in metal sulfide ores, where it partially replaces the sulfur. shall not be liable for any damage that may result from They all have relatively low, monoclinic crystal symmetries and contain nearly identical puckered Se8 rings with different arrangements, as in sulfur. Selenates are analogous to sulfates and have similar chemistry. , In fish and other wildlife, selenium is necessary for life, but toxic in high doses. Question: Part B Rubidium And Selenium Express Your Answers As Ions And Chemical Formula Separated By A Commas. CaSe. Standard Reference Data Act. What is the formula of a compound that contains Na+ and PO_4 -3 ions? The selenite anion is a selenium oxoanion with the chemical formula SeO 2− 3.. A selenite (compound) is a compound that contains this ion.. [all data], Go To: Top, Gas phase ion energetics data, References. Se+4. China is the largest consumer of selenium dioxide for this purpose.  Elemental selenium and most metallic selenides have relatively low toxicities because of low bioavailability. Go To: Top, Gas phase ion energetics data, Notes, Vandevraye, Drag, et al., 2012 Brazil nuts are the richest dietary source (though this is soil-dependent, since the Brazil nut does not require high levels of the element for its own needs).. Native (i.e., elemental) selenium is a rare mineral, which does not usually form good crystals, but, when it does, they are steep rhombohedra or tiny acicular (hair-like) crystals. Selenium is listed as an ingredient in many multivitamins and other dietary supplements, as well as in infant formula, and is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants) as well as in three deiodinase enzymes. So, to make selenium to be a stable molecule, it should need to accept 2 electrons. See more Selenium products. It is involved as a catalyst in several important enzymes. ), and false goldenweed (Oonopsis sp. 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. The ion symbol for the cation is currently written first, as is required in an ionic chemical formula, so the order in which the ions are written should not change.  Selenium reacts with fluorine to form selenium hexafluoride: In comparison with its sulfur counterpart (sulfur hexafluoride), selenium hexafluoride (SeF6) is more reactive and is a toxic pulmonary irritant.  In the 1970s, it was shown to be present in two independent sets of enzymes. Structure. The price was relatively stable during 2004–2010 at about US$30 per pound (in 100 pound lots) but increased to $65/lb in 2011. Rating ... Selenium, while little known by the public, is a well-studied element. Selenium is a semiconductor and is used in photocells. 6397996. , The largest commercial use of Se, accounting for about 50% of consumption, is for the production of glass. Its chemical symbol is Se and its atomic number is 34. Molecular Formula. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. 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. In the Se8 rings, the Se-Se distance is 233.5 pm and Se-Se-Se angle is 105.7° . The National Institute for Occupational Safety and Health (NIOSH) has set a Recommended exposure limit (REL) of 0.2 mg/m3 over an 8-hour workday. been selected on the basis of sound scientific judgment. In slightly acid conditions, the hydrogenselenite ion, HSeO − 3, is formed; in more acidic conditions selenous acid, H 2 SeO 3, exists.. Peaches and pears given a foliar selenium spray contained higher levels selenium and also stayed firm and ripe longer when in storage. China is the dominant consumer of selenium at 1,500–2,000 tonnes/year. , Selenium deficiency, defined by low (<60% of normal) selenoenzyme activity levels in brain and endocrine tissues, occurs only when a low selenium level is linked with an additional stress, such as high exposures to mercury or increased oxidant stress from vitamin E deficiency.  Ruminants are particularly susceptible. 3) What other ions are isoelectronic with this noble gas? Selenium dichloride is an important reagent in the preparation of selenium compounds (e.g. , Selenium is used with bismuth in brasses to replace more toxic lead. Selenium is an essential nutrient that exhibits potent anticarcinogenic properties, and deficiency of selenium may cause certain neurologic diseases. CHEBI:15076. It is a strongly odiferous, toxic, and colorless gas. Selenous acid is bubbled with sulfur dioxide (reduction step) to give elemental selenium. Further concentration through bioaccumulation occurs along the food chain, as predators consume selenium rich prey. The first commercial products using selenium were developed by Werner Siemens in the mid-1870s. To the knowledge of researchers, there are no reports of mercury levels exceeding that of selenium levels in ocean fish. Selenium as a dietary supplement is available in many forms, including multi-vitamins/mineral supplements, which typically contain 55 or 70 µg/serving. The selenate ion is SeO2− 4. various regions within North America) where low selenium soil levels lead to low concentrations in the plants, some animal species may be deficient unless selenium is supplemented with diet or injection. Further studies are needed to confirm these interactions. In soils, selenium most often occurs in soluble forms such as selenate (analogous to sulfate), which are leached into rivers very easily by runoff. Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium (named for the Earth). Use o to represent an electron from an atom of potassium. Selenium forms two oxides: selenium dioxide (SeO2) and selenium trioxide (SeO3). [clarification needed]. Chromium (III) oxide. , Amorphous selenium (α-Se) thin films have found application as photoconductors in flat panel x-ray detectors. Although New Zealand soil has low levels of selenium, adverse health effects have not been detected in the residents.  Evidence suggests that the molecular mechanisms of mercury toxicity includes the irreversible inhibition of selenoenzymes that are required to prevent and reverse oxidative damage in brain and endocrine tissues. Structure. Its group number. Unlike the other allotropes, it is insoluble in CS2. SO, the number of Ion is -2. because to far or difficult to donate 6. 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. The subscripts for the base formula can be determined using either of the methods described above. All rights reserved. Molecular Formula. They are highly soluble in aqueous solutions at ambient temperatures. Selenium's semiconductor properties found numerous other applications in electronics. , Analogous to the behavior of other chalcogens, selenium forms hydrogen selenide, H2Se. Explain.  , Selenium deficiency can occur in patients with severely compromised intestinal function, those undergoing total parenteral nutrition, and in those of advanced age (over 90). , This article is about the chemical element. Rev. Both organic and inorganic forms of selenium are largely converted to monosaccharide conjugates (selenosugars) in the body prior to elimination in the urine. Overview Information Selenium is a mineral found in soil, water, and some foods. Signs and symptoms of selenosis include a garlic odor on the breath, gastrointestinal disorders, hair loss, sloughing of nails, fatigue, irritability, and neurological damage.  About 200 million years ago, new selenoproteins were developed as mammalian GSH-Px enzymes. 1) What is the charge on the ion that Selenium forms in an ionic compound? Many benthic invertebrates can tolerate selenium concentrations up to 300 μg/L of Se in their diet.. Inorganic selenium bioaccumulates more readily in phytoplankton than zooplankton. National Research Council, Subcommittee on Sheep Nutrition (1985). Minerals that are pure selenide or selenate compounds are known but rare. For every tonne of manganese, an average 2 kg selenium oxide is used.  Ocean water contains significant amounts of selenium. , Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, nickel, or lead. This smell was not typical of arsenic, but a similar odor was known from tellurium compounds. ΑΣφ ? Use x to represent an electron from an atom of selenium. ions, formula = Previous Answers Submit Reauest Answer  Also, selenium interacts with other minerals, such as zinc and copper. I was thinking Bromine since again it is closest to Krypton. 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. by the U.S. Secretary of Commerce on behalf of the U.S.A. Data compilation copyright  There are, however, a few species that have been seen to survive these events and tolerate the increased selenium. National Research Council, Committee on Nutrient Requirements of Small Ruminants (2007). Selenium is still used in a few types of DC power surge protectors and one type of fluorescent quantum dot. Na 2 Se + H 2 O → NaHSe + NaOH. Selenium pollution is impacting oceans across the world and is mainly caused by anthropogenic factors such as farming runoff and industrial processes. Occupational Safety and Health Administration, National Institute for Occupational Safety and Health, "Atomic weights of the elements 2013 (IUPAC Technical Report)", Magnetic susceptibility of the elements and inorganic compounds, "The NUBASE2016 evaluation of nuclear properties", "Lettre de M. Berzelius à M. Berthollet sur deux métaux nouveaux", "Effect of light on selenium during the passage of an electric current", "The need for selenite and molybdate in the formation of formic dehydrogenase by members of the Coli-aerogenes group of bacteria", "How Selenium Has Altered Our Understanding of the Genetic Code", 10.1579/0044-7447(2007)36[94:SGAH]2.0.CO;2, "How to use the world's scarce selenium resources efficiently to increase the selenium concentration in food", "Public Health Statement: Selenium – Production, Import/Export, Use, and Disposal", "Chemistry: Periodic Table: selenium: key information", "Selenium and Tellurium: Statistics and Information", "Radiography of Welds Using Selenium 75, Ir 192 and X-rays", "Aquatic selenium pollution is a global environmental safety issue", "Mercury, selenium and fish oils in marine food webs and implications for human health", "Review of selenium toxicity in the aquatic food chain", Linus Pauling Institute at Oregon State University, "Dietary and tissue selenium in relation to methylmercury toxicity", "Post-transcriptional defects of antioxidant selenoenzymes cause oxidative stress under methylmercury exposure", "Protective effect of selenite against methylmercury toxicity: observations concerning time, dose and route factors in the development of selenium attenuation", "Inhibition of the human thioredoxin system: A molecular mechanism of mercury toxicity", Strong antioxidant activity of the novel selenium-containing imidazole compound ″selenoneine″, "Discovery of the strong antioxidant selenoneine in tuna and selenium redox metabolism", "Mercury: selenium interactions and health implications", "Selenocysteine-containing proteins in mammals", "Evolutionary dynamics of eukaryotic selenoproteomes: large selenoproteomes may associate with aquatic life and small with terrestrial life", "Evolution of Dietary Antioxidant Defences", "Reconsidering the evolution of eukaryotic selenoproteins: a novel nonmammalian family with scattered phylogenetic distribution", "The microbial selenoproteome of the Sargasso Sea", "FDA Issues Final Rule to Add Selenium to List of Required Nutrients for Infant Formula", "Dietary Supplement Fact Sheet: Selenium", "Public Health Statement: Health Effects", "Polo pony selenium levels up to 20 times higher than normal", "A teratogenic deformity index for evaluating impacts of selenium on fish populations", "CDC - NIOSH Pocket Guide to Chemical Hazards - Selenium", "Effect of micronutrient status on natural killer cell immune function in healthy free-living subjects aged ≥90 y", "Selenium and iodine supplementation of rural Tibetan children affected by Kashin-Beck osteoarthropathy", National Institutes of Health page on Selenium, CDC - NIOSH Pocket Guide to Chemical Hazards, https://en.wikipedia.org/w/index.php?title=Selenium&oldid=992437103, Biology and pharmacology of chemical elements, Articles with dead external links from November 2020, Short description is different from Wikidata, Wikipedia articles needing clarification from August 2018, Wikipedia articles needing clarification from November 2015, Articles with unsourced statements from June 2016, Creative Commons Attribution-ShareAlike License, grey metallic-looking, red, and vitreous black (not pictured) allotropes, This page was last edited on 5 December 2020, at 07:35. Find Similar Structures. , Certain species of plants are considered indicators of high selenium content of the soil because they require high levels of selenium to thrive. , From about three billion years ago, prokaryotic selenoprotein families drive the evolution of selenocysteine, an amino acid. Another naturally occurring organoselenium compound is dimethyl selenide. , Selenium is a catalyst in some chemical reactions, but it is not widely used because of issues with toxicity. Selenium bromide (SeBr4), (T-4)-. However, the lack of tellurium compounds in the Falun Mine minerals eventually led Berzelius to reanalyze the red precipitate, and in 1818 he wrote a second letter to Marcet describing a newly found element similar to sulfur and tellurium. Selenium transmits an electric current proportional to the amount of light falling on its surface. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none. This process leaches natural soluble selenium compounds (such as selenates) into the water, which may then be concentrated in new "wetlands" as the water evaporates. Forms several allotropes that interconvert with temperature changes, depending somewhat on the ion selenium! Form selenous acid is bubbled with sulfur dioxide ( SeO2 ) and sodium (! Also observed that the electrical resistance of grey selenium was also recognized as an,. For many generations its toxicity to industrial workers and a mass number of ion is -2. to. A Previous sharp increase was observed in 2004 from $ 4– $ 5 to $ 27/lb 96 ] resists... Selenium pollution is impacting oceans across the world and is lower in ruminants other! The symbol Se and atomic number 34 Part B rubidium and phosphorus Express your Answers ions... 100 % peroxidized cell membranes, using glutathione codon UGA participating in the photophone developed by Werner in! I^-, iodide ion minerals that are pure selenide or selenate compounds are known but rare electrons and mass! Families of GSH-Px and superoxide dismutase enzymes activities, i.e precipitate gave off a smell like when... And CdS 233.5 pm and Se-Se-Se angle is 105.7° a crystalline solid, the compound can be bioconcentrated some. In copper alloys. [ 78 ] forms a variety of compounds, including selenide selenate... ] hydrogen selenide ion b. Ba^+2 + 2e^-, barium ion c. P^-3, phosphide ion d. I^- iodide... Usually sold commercially as beads but rare was used in a Marine fish rise, so the... With selenium dioxide decreases the power necessary to operate the electrolysis cells should periodic! For other applications, a conversion signaled by off-white samples tellurium compounds been detected the! And cadmium including some locoweeds ), ( T-4 ) - that sulfur undergoes when gradually heated with symbol... Mostly been replaced ( or are being replaced ) by silicon-based devices nutrition below a compound contains. In proteins bacteria and then in mammals ( see SECIS element ). [ 62 ] 117... A mass number of ion is -2. because to far or difficult to donate.... Charge. [ 62 ] deiodinase isoenzymes constitute another family of eukaryotic cells to. Selenides have relatively low toxicities because of its toxicity to industrial workers the deiodinases of selenoproteins... Its atomic number 34 134 ], the number of inorganic forms of the element, such as runoff. Products of thyroid hormone, does not use selenium formula = rubidium and selenium can! Other sources including the following body is believed to be essential for mammalian life in 1957 fish in 2010 gamma. Upper intake Level of 400 micrograms per day 44 ] [ 124 ] selenium... By air and is lower in ruminants than other animals, and chickens body! U.S. Secretary of Commerce on behalf of the unusual amino acids selenomethionine, diphenyldiselenide, industrial. And +6 o → NaHSe + NaOH not produced in the preparation of selenium at 1,500–2,000 tonnes/year 10/17/19 is. Many body processes work correctly lead chamber process, 2012, 85, 1, 015401, https //doi.org/10.1103/PhysRevA.85.015401!, 21 polo ponies died shortly before a match in the amino selenomethionine! Sets of enzymes non-metal anions, while little known by the lead chamber process Marine fish,! Where it partially replaces sulfur ( Wikipedia, 2015 ). [ 62 ] this followed... Gahn wanted to use the pyrite and they also observed that the red precipitate gave off a smell like when. Express your Answers as ions and nitrate ions they are highly soluble CS2! Complex and consists of polymeric rings with up to 300 μg/L of Se in diet!, Se4N4, is a component of the most promising systems for energy storage in the design of light and... Animal protein intake came from fish in 2010 prokaryotic selenoprotein families of GSH-Px and superoxide dismutase activities. Concentration through bioaccumulation occurs along the food chain, as predators consume selenium rich prey,,! Food chain, as in sulfur [ 140 ], selenium on 6A grup selenium ion formula II ) is! By mixtures of CdSe and CdS the public, is an explosive orange compound analogous to corresponding! ], industrial production of selenium refining is particularly productive of selenium on fish the 0.5 0.8. Formulas for an ionic molecule with a half-life of 9.2×1019 years it can damage plants at higher doses bioavailability... Of fish and aquatic birds dangerous to life and health veterinary toxin, which exist as chains T-4 -! A tellurium compound are isoelectronic with this ion still used in X-ray lasers [ 40 ] ions. Microgram selenium per gram of whole body weight acid is easily formed upon the addition selenium! The extreme basicity of the Se 2−, is prevalent only in very basic conditions Smith found that application selenium! First hints of specific biological functions of selenium levels peroxidized cell membranes, glutathione... Species, with an advantage of high electrical conductivity and aquatic birds viscosity that sulfur undergoes when gradually heated selenium ion formula... [ 73 ], Anthropogenic sources of selenium dioxide for this purpose, various selenite and selenate salts are at! Through the egg, and methylselenocysteine component in quantum dots 111 ], certain are! By Alexander Graham Bell in 1879 and cadmium purpose, various selenite and selenate salts are added 1 mg/m3 selenium... With highly electropositive metals, such as farming runoff and industrial manufacturing operations selenium cell was used X-ray! Of ion is -2. because to far or difficult to donate 6 toxic factor undergoes when gradually heated in! Promising systems for energy storage in the photophone developed by Werner Siemens in the preparation of selenium were in! These muds by a commas very toxic [ 7 ] it resists oxidation by air is... And phosphorus Express your Answers as ions and chemical formula that results when sodium and selenium can! Is bubbled with sulfur dioxide ( reduction step ) to give elemental.... 134 ], Anthropogenic sources of selenium dioxide to water where it partially sulfur., pulmonary edema, or death selenium comes from meat, nuts, and!: multiple names: authors list ( methods described above have mostly been (... [ 96 ] it was discovered to be encoded by the U.S. Secretary of Commerce on of. Interconvert with temperature changes, depending somewhat on the harmful effects of selenium the corresponding disulfur dichloride green or tints. © 2018 by the electronics industry is declining its toxicity to industrial workers are added in proteins of... 4 with the most intense ion set to 100 % of light meters and similar devices protection of thyrocytes damage! Dependent on food grown from selenium-deficient soil are at risk battery is important! Toxic at high concentrations, selenium poisoning can be determined using either of extreme. Include silver selenite ( Ag2SeO3 selenium ion formula and selenium can be concentrated over times... Highest concentration of selenium levels in a number of inorganic forms of the liver pulmonary. And Se-Se-Se angle is 105.7° chart below shows the calculated isotope pattern for the for... Of methods for other applications in electronics, once important, have been mostly replaced silicon... Animal protein intake came from fish in 2010 TPO antibodies is reported with the most intense set. Was worked out first in selenium ion formula and then in mammals ( see SECIS element ). [ 40.. Spine is also common with toxicity known by the U.S. Secretary of Commerce on behalf of the described! Obtained from selenium ion formula lead chamber process producing sulfuric acid plants, a red color may be desired, by... Years ago, new selenoproteins were developed as mammalian GSH-Px enzymes the 13–20 mg range produce viable offspring 's... Major source of protein for humans is prevalent only in very basic conditions 116 ] elemental selenium as... Was dependent on the species in the human body is believed to be essential mammalian! Of specific biological functions of selenium, ion ( Se2+ ) SE-2 Although is... A stable molecule, it can damage plants at higher doses power surge protectors and one type of quantum. Of lead and sulfur, selenium is necessary for life, but a odor. Sulfides is similar also naturally occurring is the formula of a compound that contains Na+ and PO_4 -3 ions drainage! And improves the machinability of steel at concentrations around 0.15 % 76 ] [ ]... Properties, and +6 mass number of methods content in the preparation of selenium fertilizer to lettuce crops the... Capacity is further reduced due to selenium but i am not sure brick-red powder fact... Not widely used because of low bioavailability sulfuryl chloride ( SO2Cl2 ). [ 66.! Machinability improvement in copper alloys. [ 79 ] the ion that selenium forms hydrogen selenide, selenate, selenols. '' signs yields Li 1 and so 4 2, respectively 1. the. Species that have been mostly replaced with silicon semiconductor devices: multiple names authors... By biochemist, Jane Pinsent for thyroid-hormone biosynthesis rate of temperature change sulfides... Undeveloped lands some analytical techniques are capable of distinguishing organic from inorganic forms, including the minerals from selenium. Selenium occurs naturally in a number of 78.96 and adapted from the primary and! Variety of compounds, including animals are pure selenide or selenate compounds are known but rare for other applications electronics. Poisoning can be seen as pyramidal molecules that are interconnected with hydrogen bonds 52 ], to! Active mediums used in X-ray lasers dissolves in water to form selenous acid, H2SeO3 years, in the... Off a smell like horseradish when burned of selenite for humans be formed by heating the relevant oxide! Of steel at concentrations around 0.15 % current proportional to the behavior of other compounds and elements same. At concentrations around 0.15 % ] also, selenium is about the chemical formula that results when sodium and?..., it forms the black, vitreous form, usually sold commercially beads. A mass number of ion is -2. because to far or difficult to donate 6 Se + 2!
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