Thulium
| Element Name | Thulium |
|---|---|
| Symbol | Tm |
| Atomic Number | 69 |
| Group | Rare Earth |
| Crystal Structure | Hexagonal |
| Atomic Mass | 168.93421 |
| Electronic Configuration | 2,8,18,31,8,2 |
| Orbital Configuration | [Xe] 4f13 6s2 |
| Valency | 3 |
| Melting Point | 1545°C |
| Boiling Point | 1950°C |
| Electo-negativity | 1.25 |
| Covalent Radius | 1.56 Å |
