Thorium
Actinide| Atomic number | 90 |
|---|---|
| Category | Actinide |
| Atomic mass | 232.04 |
| Electron configuration | [Rn]6d² 7s² |
| Oxidation states | +4 |
| Electronegativity | 1.3 |
| Melting point | 1,750 °C |
| Boiling point | 4,788 °C |
| Density | 11.72 g/cm³ |
| Crystal structure | Face-centred cubic |
| Period | 7 |
| Block | f |
| Discovered | 1,829 |
| Crustal abundance | 9.6 ppm |
