Selenium Molecule: Difference between revisions

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== References ==
== References ==


=== 2016 ===
 
* (Wikipedia, 2016) ⇒ https://en.wikipedia.org/wiki/Selenium Retrieved:2016-6-1.
=== 2020 ===
** '''Selenium''' is a [[chemical element]] with symbol '''Se''' and [[atomic number]]&nbsp;34. It is a [[nonmetal]] with properties that are intermediate between those of its [[periodic table]] column-adjacent [[chalcogen]] elements [[sulfur]] and [[tellurium]]. It rarely occurs in its elemental state in nature, or as pure ore compounds. Selenium ([[Greek language|Greek]] σελήνη ''[[selene]]'' meaning "Moon") was discovered in 1817 by [[Jöns Jacob Berzelius]], who noted the similarity of the new element to the previously known [[tellurium]] (named for the Earth). <P> Selenium is found in [[metal]] [[sulfide]] [[ore]]s, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known, but are rare. The chief commercial uses for selenium today are in [[glassmaking]] and in [[pigment]]s. Selenium is a [[semiconductor]] and is used in [[photocell]]s. Uses in [[electronics]], once important, have been mostly supplanted by [[silicon]] semiconductor devices. Selenium continues to be used in a few types of DC power [[surge protector]]s and one type of [[Fluorescence|fluorescent]] [[quantum dot]]. <P> Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including [[infant formula]]. It is a component of the antioxidant enzymes [[glutathione peroxidase]] and [[thioredoxin reductase]] (which indirectly reduce certain [[Redox|oxidized]] molecules in animals and some plants). It is also found in three [[deiodinase]] enzymes, which convert one [[thyroid hormone]] to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts, and others apparently requiring none.<ref name="Ruyle"></ref>
* (Wikipedia, 2020) ⇒ https://en.wikipedia.org/wiki/Selenium Retrieved:2020-2-13.
** '''Selenium''' is a [[chemical element]] with the [[Symbol (chemistry)|symbol]] '''Se''' and [[atomic number]]&nbsp;34. 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]]. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium – from [[Ancient Greek]] (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). <P> Selenium is found in [[:Category:Sulfide minerals|metal sulfide ores]], where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are [[glassmaking]] and [[pigment]]s. Selenium is a [[semiconductor]] and is used in [[photocell]]s. Applications in [[electronics]], once important, have been mostly replaced with [[silicon]] semiconductor devices. Selenium is still used in a few types of DC power [[surge protector]]s and one type of [[Fluorescence|fluorescent]] [[quantum dot]]. <P> Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including [[infant formula]]. It is a component of the antioxidant enzymes [[glutathione peroxidase]] and [[thioredoxin reductase]] (which indirectly reduce certain [[Redox|oxidized]] molecules in animals and some plants). It is also found in three [[deiodinase]] enzymes, which convert one [[thyroid hormone]] to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none.<ref name="Ruyle"></ref>
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=== 2020 ===
* (Wikipedia, 2020) ⇒ https://en.wikipedia.org/wiki/Selenium Retrieved:2020-2-13.
** '''Selenium''' is a [[chemical element]] with the [[Symbol (chemistry)|symbol]] '''Se''' and [[atomic number]]&nbsp;34. 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]]. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium – from [[Ancient Greek]] (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). <P> Selenium is found in [[:Category:Sulfide minerals|metal sulfide ores]], where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are [[glassmaking]] and [[pigment]]s. Selenium is a [[semiconductor]] and is used in [[photocell]]s. Applications in [[electronics]], once important, have been mostly replaced with [[silicon]] semiconductor devices. Selenium is still used in a few types of DC power [[surge protector]]s and one type of [[Fluorescence|fluorescent]] [[quantum dot]]. <P> Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including [[infant formula]]. It is a component of the antioxidant enzymes [[glutathione peroxidase]] and [[thioredoxin reductase]] (which indirectly reduce certain [[Redox|oxidized]] molecules in animals and some plants). It is also found in three [[deiodinase]] enzymes, which convert one [[thyroid hormone]] to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none.<ref name="Ruyle"></ref>

Revision as of 21:24, 13 February 2020

A Selenium Molecule is a chemical element with atomic number 34.

References

2020

  • (Wikipedia, 2020) ⇒ https://en.wikipedia.org/wiki/Selenium Retrieved:2020-2-13.
    • Selenium is a chemical element with the symbol Se and atomic number 34. 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. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium – from Ancient Greek (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).

      Selenium is found in metal sulfide ores, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are glassmaking and pigments. Selenium is a semiconductor and is used in photocells. Applications in electronics, once important, have been mostly replaced with silicon semiconductor devices. Selenium is still used in a few types of DC power surge protectors and one type of fluorescent quantum dot.

      Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including infant formula. It is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants). It is also found in three deiodinase enzymes, which convert one thyroid hormone to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none.[1]

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Ruyle
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