atomic number 19
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|Noun||1.||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|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
carnallite - a white or reddish mineral consisting of hydrous chlorides of potassium and magnesium; used as a fertilizer and as a source of potassium and magnesium
kainite - a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer
langbeinite - a mineral consisting of potassium magnesium double sulphate; used as a fertilizer