| Thorium | |
| Elemental State | Th |
| Electron Configuration | 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d2 |
| First Ionization Potential | 6.307 eV |
| Electron Affinity | eV |
| Z* | |
| Pauling Electronegativity | 1.3 |
| Covalent Radius | |
| Metallic Radius | 1.80 Å |
| Ionic Radius | 1.08 Å Th4+ coordination number
= 6
1.19 Å Th4+ coordination number = 8 1.23 Å Th4+ coordination number = 9 |
| van der Waal's Radius | |
| Melting Point | 1750 oC |
| Boiling Point | 4788 oC |
| Density | 11.72 g/cm3 |
| Other Properties | All isotopes are radioactive
232Th half-life = 1.4×1010 years |