New York , NY
Charles D Winters
Photograph - Photograph
Selenium (Se) is a nonmetallic element that exhibits allotropy appearing in a number of forms including a gray crystalline metal-like form called "metallic" selenium. It has the atomic number 34 and is used in the vulcanization of rubber, the manufacture of red glass, in electronics, and in xerography.
May 8th, 2013
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