57
La
lanthanum
138.91

General properties

Group
n/a
Period
period 6
Category
lanthanoids
Standard atomic weight
138.905 47(7)
Melting point
1193 K (920 °C)
Boiling point
3737 K (3464 °C)
Phase at STP
solid

Additional properties

Block
f-block
Electron configuration
[Xe] 5d¹ 6s²
Electrons per shell
2, 8, 18, 18, 9, 2
Electronegativity
1.1
Density
6.162 g/cm³
Oxidation states
0, +1, +2, +3 (a strongly basic oxide)
CAS Number
7439-91-0