19K
Potassium
칼륨 · カリウム
Alkali metal
Atomic number19
ElementK — Potassium
Atomic mass39.098
CategoryAlkali metal
Group1
Period4
Electron config[Ar] 4s1
Shells2,8,8,1
State (RT)Solid
Melting pt63°C
Boiling pt759°C
Electronegativity0.82
Discovered1807
Main usesFertilizers, body electrolytes
2 · 8 · 8 · 1