Barium

Alkaline earth metals · Group 2 · Period 6

Atomic properties

Atomic number	56
Symbol	Ba
Standard atomic weight	137.33
Classification	Alkaline earth metals
Group	2
Period	6
Block	s-block
Electron configuration	[Xe] 6s2
Electronegativity (Pauling)	0.89
Common oxidation states	+2

Physical properties

Phase at 20 °C	Solid
Density	3.51 g/cm³
Melting point	727 °C
Boiling point	1845 °C
Discovered	1808
CAS number	—

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