potassium

Symbol: K
Atomic number: 19
Atomic weight: 39.0983
Group: 1
Group name: Alkali metal
Period: 4
Block: s
CAS ID: 7440-09-7
Shell structure: 2.8.8.1
Electron configuration: [Ar].4s1
State: |standardstate|
Melting point: 336.53 [or 63.38 °C (146.08 °F)]
Boiling point: 1032 [or 759 °C (1398 °F)]
Ionization energy/kJ per mol: 418.8
Common oxidation states: 1
Pauling electronegativity: 0.82