Gadolinium (Gd)
Gadolinium is the chemical element with atomic number 64 and symbol Gd. It is a lanthanoid in period 6, with a standard atomic weight of 157.25 u.
Key facts
- Z
- 64
- Atomic weight
- 157.25 u
- Category
- lanthanoid
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1880
- CAS
- 7440-54-2
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.2 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,586 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,546 K | National Center for Biotechnology Information (NIH) |
| Density stp | 7.9 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 237 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 593.4 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Xe] 4f⁷ 5d¹ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f⁷ 5s² 5p⁶ 5d¹ 6s²
- Electrons per shell
- 2, 8, 18, 25, 9, 2