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Selenium

35:04

Everything Matters | Selenium

2:12

Selenium - Periodic Table of Videos

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Element exploration: Selenium

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Why selenium looks like red blood cells

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What is SELENIUM?

Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal 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 was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium.
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