56
Ba
barium
137.33

General properties

Group
group 2 (alkaline metals)
Period
period 6
Category
alkaline earth metals
Standard atomic weight
137.327(7)
Melting point
1000 K (727 °C)
Boiling point
2118 K (1845 °C)
Phase at STP
solid

Additional properties

Block
s-block
Electron configuration
[Xe] 6s²
Electrons per shell
2, 8, 18, 18, 8, 2
Electronegativity
0.89
Density
3.51 g/cm³
Oxidation states
+1, +2 (a strongly basic oxide)
CAS Number
7440-39-3