A silvery-white metallic alkali metal element with the symbol K and atomic number 19, occurs principally as component of sea water and in several minerals like carnallite, polyhalite and sylvite. It is being used as fertilizer as either the chloride, sulfate or carbonate.
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
