68 Er Erbium 167.26
Lanthanide
Erbium 铒
[Xe] 4f¹² 6s²
- Period 6
- Group —
- Block f
- Solid
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹² 5s² 5p⁶ 6s²
Orbital diagram (valence)
- Electrons per shell
- 2, 8, 18, 30, 8, 2
- Unpaired electrons
- 2
- Zeff (Slater)
- 2.85
Properties
- Atomic weight
- 167.26
- Electronegativity (Pauling)
- 1.24
- First ionization energy
- 589.3 kJ/mol
- Electron affinity
- no data
- Covalent radius
- 189 pm
- van der Waals radius
- 235 pm
- Melting point
- 1802 K
- Boiling point
- 3141 K
- Density
- 9.07 g/cm³
- Melting / boiling point
- 1528.8 °C / 2867.8 °C
- Common oxidation states
- +3
- Discovered
- 1843
Periodic trend
Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).