halogen, greenish-yellow gas, combines with almost all elements, respiratory irritant, odorous, highly toxic
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35.453
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3.214
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-100.98
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-34.6
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-1,+5,+7
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(Gr. chloros, greenish yellow) Discovered by Scheele in 1774 and named by Davy in 1810. Not found in a free state in nature, found commonly with Na as NaCl.
Chlorine was used as a war gas in 1915.
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used to provide safe drinking water, paper products, dyestuffs, textiles, petroleum products, medicines, insecticides, antiseptics, plastics, solvents