atomic number 19

Noun atomic number 19 has 1 sense

• atomic number 19(n = noun.substance) k, potassium - 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;
is a kind of metal, metallic element