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SELENIUM

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34

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Se

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78.96

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2-8-18-6

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4.8

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217° C

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685° C

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+2+4+6-2

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monoclinic

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red (powder), black (vitreous), gray (crystalline), non-metal

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photoelectric cells, exposure meters, rectifiers, transistors, red glass,
xerography


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Discovered in 1817 by Berzelius.