| Attribute | Value |
|---|---|
| Symbol | Pm |
| Standard state | Solid |
| Atomic mass | 144.91276 u |
| Electron configuration | [Xe]6s²4f⁵ |
| Oxidation states |
|
| Atomic radius (van der waals) | 236 pm |
| Ionization energy | 5.55 eV |
| Melting point | 1315 K |
| Boiling point | 3273 K |
| Density | 7.26 g/cm³ |
| Atomic number | 61 |
| Group name | Lanthanide |
| Discovered | 1945 year |
| Electronegativity (pauling scale) | Add |
| Electron affinity | Add |