Erbium
Erbium, 68Er
 |
| General properties |
| Name, symbol
|
erbium, Er |
| Pronunciation |
UR-bee-əm
|
| Appearance |
silvery white |
|
| Erbium in the periodic table
|
|
|
| Atomic number (Z) |
68 |
|
Group, block
|
group n/a, f-block
|
| Period |
period 6 |
| Element category |
lanthanide
|
|
Standard atomic weight (±) (Ar)
|
167.259(3) |
| Electron configuration |
[Xe] 4f12 6s2
|
|
Electrons per shell
|
2, 8, 18, 30, 8, 2 |
| Physical properties |
| Phase |
solid |
| Melting point |
1802 K (1529 °C, 2784 °F) |
| Boiling point |
3141 K (2868 °C, 5194 °F) |
|
Density near r.t.
|
9.066 g/cm3
|
| when liquid, at m.p. |
8.86 g/cm3
|
| Heat of fusion |
19.90 kJ/mol
|
| Heat of vaporization |
280 kJ/mol |
| Molar heat capacity |
28.12 J/(mol·K) |
|
Vapor pressure
|
