68
Er
Erbium
Lanthanide period 6 f-block discovered: 1843
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 68
- Atomic mass
- 167.26 a.m.u.
- Electron configuration
- [Xe]6s2 4f12
- Electronegativity
- 1.24 on the Pauling scale
- Atomic radius
- 235 pm
- Ionization energy
- 6.108 eV
- Oxidation states
- +3
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1802 K (1 528,85 °C)
- Boiling point
- 3141 K (2 867,85 °C)
- Density
- 9.07 g/cm³