Erbium (Er)
Erbium is the chemical element with atomic number 68 and symbol Er. It is a lanthanide in period 6, with a standard atomic weight of 167.26 u.
Faits essentiels
- Z
- 68
- Atomic weight
- 167.26 u
- Category
- lanthanide
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1843
- CAS
- 7440-52-0
Propriétés mesurées
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.24 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,802 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,141 K | National Center for Biotechnology Information (NIH) |
| Density stp | 9.07 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 235 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 589.3 kJ/mol | National Center for Biotechnology Information (NIH) |
Configuration électronique
- Noble gas notation
- [Xe] 4f¹² 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹² 5s² 5p⁶ 6s²
- Electrons per shell
- 2, 8, 18, 30, 8, 2