CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
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.
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