68
Er
erbium
167.26

General properties

Group
n/a
Period
period 6
Category
lanthanoids
Standard atomic weight
167.259(3)
Melting point
1802 K (1529 °C)
Boiling point
3141 K (2868 °C)
Phase at STP
solid

Additional properties

Block
f-block
Electron configuration
[Xe] 4f¹² 6s²
Electrons per shell
2, 8, 18, 30, 8, 2
Electronegativity
1.24
Density
9.066 g/cm³
Oxidation states
0, +1, +2, +3 (a basic oxide)
CAS Number
7440-52-0