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Thorium, 90Th
| Cas No. | 7440-29-1 |
| Appearance | silvery, often with black tarnish |
| Atomic Number(Z) | 90 |
| Phase at STP | solid |
| Melting point | 2023 K (1750 °C, 3182 °F) |
| Boiling point | 5061 K (4788 °C, 8650 °F) |
| Density (near r.t.) | 11.7 g/cm3 |
| Heat of fusion | 13.81 kJ/mol |
| Heat of vaporisation | 514 kJ/mol |
| Molar heat capacity | 26.230 J/(mol·K) |