Thulium
Lanthanide| Atomic number | 69 |
|---|---|
| Category | Lanthanide |
| Atomic mass | 168.93 |
| Electron configuration | [Xe]4f¹³ 6s² |
| Oxidation states | +3 |
| Electronegativity | 1.25 |
| Melting point | 1,545 °C |
| Boiling point | 1,950 °C |
| Density | 9.32 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Period | 6 |
| Block | f |
| Discovered | 1,879 |
| Crustal abundance | 0.52 ppm |