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Noun atomic number 19 has 1 sense
- potassium, K, atomic number 19 - 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
--1 is a kind of metallic element, metal
--1 is a substance of
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