| Thulium ✕ | |
|---|---|
| Symbol | Tm |
| Atomic number | 69 |
| Chemical property | Lanthanide |
| Origin o the name | Thule, the ancient name for Scandinavia |
| Period | 6 |
| Atomic weight (u) | 168.93422 |
| Atomic weight uncertainty (u) | 0.00002 |
| Density (g/cm³) | 9.321 |
| Melting point (K) | 1818 |
| Boiling point (K) | 2223 |
| Heat capacity (J/(g·K)) | 0.16 |
| Electro-negativity | 1.25 |
| Abundance in earth's crust (mg/kg) | 0.52 |