56Ba
Barium
바륨 · バリウム
Alkaline earth
Atomic number56
ElementBa — Barium
Atomic mass137.33
CategoryAlkaline earth
Group2
Period6
Electron config[Xe] 6s2
Shells2,8,18,18,8,2
State (RT)Solid
Melting pt727°C
Boiling pt1845°C
Electronegativity0.89
Discovered1808
Main usesX-ray contrast, drilling fluids
2 · 8 · 18 · 18 · 8 · 2