| Promethium | |
| Elemental State | Pm |
| Electron Configuration | 1s22s22p63s23p63d104s24p64d105s25p66s24f5 |
| First Ionization Potential | 5.58 eV |
| Electron Affinity | |
| Z* | |
| Pauling Electronegativity | |
| Covalent Radius | |
| Metallic Radius | |
| Ionic Radius | |
| van der Waal's Radius | |
| Melting Point | 1042 oC |
| Boiling Point | ~3000 oC |
| Density | 7.264 g/cm3 |
| Other Properties | Man made; all isotopes are radioactive
145Pm half-life = 17.7 years |