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Promethium
| Element Name | Promethium |
|---|---|
| Symbol | Pm |
| Atomic Number | 61 |
| Group | Rare Earth |
| Crystal Structure | Hexagonal |
| Atomic Mass | -144.9127 |
| Electronic Configuration | 2,8,18,23,8,2 |
| Orbital Configuration | [Xe] 4f5 6s2 |
| Valency | 3 |
| Melting Point | 1042 °C |
| Boiling Point | 3000 °C (estimated) |
| Electo-negativity | 1.13 |
| Covalent Radius | 1.63 Å |
