Th
Thorium
Element 90 · Actinide · Period 7, Group 4
Solid · Discovered 1828
Atomic Properties
| Atomic Number | 90 |
| Atomic Mass | 232.038u |
| Electron Configuration | [Rn]7s2 6d2 |
| Electronegativity | 1.3Pauling |
| Atomic Radius | 237pm |
| Ionization Energy | 6.08eV |
| Oxidation States | +4 |
Physical Properties
| Standard State | Solid |
| Melting Point | 2023K |
| Boiling Point | 5061K |
| Density | 11.72g/cm³ |
| Group Block | Actinide |
| Year Discovered | 1828 |