Atomic Properties
- Atomic Number
- 90
- Atomic Mass
- 232.0400 u
- Electron Configuration
- [Rn] 6d2 7s2
- Electronegativity
- 1.30
- Block
- f-block
- Group
- —
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 2023.00 K
- Boiling Point
- 5061.00 K
- Density
- 11.7000 g/cm³
About Thorium
Radioactive; potential nuclear fuel; more abundant than uranium.
Isotopes of Thorium
Thorium has 1 naturally occurring isotope, plus 1 notable radioactive isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 230Th | 230 | 230.0331341 | — | Radioactive |
| 232Th | 232 | 232.0380558 | 100.00% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)