Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Promethium | |
| Electron Configuration | 2,8,18,23,8,2 |
| Electron Configuration | [Xe]] 4f5 6s2 |
| Electronegativity | 1.13 |
| Enthalpy of Fusion | 12.6 kJ mol-1 |
| Enthalpy of Vaporisation | n/a kJ mol-1 |
| Heat Capacity | ? J mol-1 K-1 |
| Thermal Conductivity | 17.9 W m-1 K-1 |
| Thermal Expansion | est. 11 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 0.75 Ω m |
| Young's modulus | est. 46 GPa |
| Shear modulus | GPa |
| Bulk modulus | est. 33 GPa |
| Poisson ratio | est. 0.28 |
| Atomic Radii |
|
| Atomic Radius
|
185 pm |
| Bohr Radius
|
205 pm |
| Covalent Radius
|
0 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Pm+3 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
535.9 |
| M+ - M2+ |
1052 |
| M2+ - M3+ |
2150 |
| M3+ - M4+ |
3970 |