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atomic number 17

ato·mic·num·ber

uncommon

noun

1.

a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)

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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.