Element overview
Potassium (K) is element 19 with a listed atomic mass of 39.0983 u. It is in group 1 and period 4. Its category is alkali metal.
Atomic properties
Electron configuration: [Ar] 4s1. Electronegativity: 0.82. Common oxidation states: +1.
Physical properties
Density: 0.862; melting point: 336.53; boiling point: 1032. Values depend on conditions, phase and source.