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www.life123.com/question/Why-Does-Our-Body-Need-Seleniu...
www.life123.com/question/Why-Does-Our-Body-Need-Selenium
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Selenium has three common allotropes: gray, black, and red. The red allotrope is nonmetallic and not malleable. The black allotrope is also nonmalleable.
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www.life123.com/question/How-Much-Selenium-Is-Too-Much
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Selenium toxicity is rare in the U.S. The few reported cases have been associated with industrial accidents and a manufacturing error ... What Is the Difference between Gray Matter and White Matter
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www.speclab.com/elements/selenium.htm
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Selenium — (Gr. Selene, moon), Se; at. wt. 78.96(3); at. no. 34; m.p. (gray) 221 ° C; b.p. (gray) 685 °C; sp. gr. (gray) 4.79, (vitreous) 4.28; valence –2, +4, or +6.
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science.howstuffworks.com/selenium-info.htm
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Jul 20, 2009 ... All four forms, and all selenium compounds, are poisonous. The metallic form, known as gray selenium, is the most stable form at ordinary ...
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www.wolframalpha.com/entities/chemicals/gray_selenium/f...
www.wolframalpha.com/entities/chemicals/gray_selenium/fn/bf/40/
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Complete information and computations for gray selenium: properties, diagrams, formulas, data, ...
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pubs.acs.org/cen/80th/selenium.html
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Appearance: Exists as two allotropes: red and gray. Red selenium, the less stable of the two, is an amorphous powder; gray selenium is a silvery metal.
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www.wolframalpha.com/entities/elements/selenium/xk/9r/t...
www.wolframalpha.com/entities/elements/selenium/xk/9r/t2/
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Complete information and computations for selenium: properties, thermodynamic properties, material properties, electromagnetic properties, ...
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chemistry.about.com/od/elementfacts/a/selenium.htm
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Selenium occurs in several forms, but is most stable as a dense gray semiconducting semimetal. Black, gray, and red selenium are shown here. wikipedia.org ...
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Selenium - Wikipedia, the free encyclopedia
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en.wikipedia.org/wiki/Selenium
The most stable allotrope of selenium is a dense purplish-gray solid. In terms of structure, it adopts a helical polymeric chain. The Se-Se distance is 2.37 Å and ...
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