Overview
Potassium is a soft, reactive metal that is essential for cellular function and electrolyte balance in organisms.
Properties
It reacts vigorously with water, has low density and forms soluble salts such as potassium chloride and nitrate.
Occurrence and Uses
Potassium compounds are mined for fertilizers, used in chemical synthesis and play key roles in physiology and agriculture.
Isotopes and Safety
Stable K 39, K 40 radioactive and K 41 isotopes exist; K 40 contributes to natural radioactivity and metallic potassium is highly reactive and stored under oil.