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atomic number 19

ato·mic·num·ber

uncommon

noun

1.

a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite

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