90 Th
Actinide
Thorium
Potential nuclear fuel.
Properties of Thorium
- Atomic number (Z)
- 90
- Symbol
- Th
- Atomic mass
- 232.04 g/mol
- Category
- Actinide
- Group
- 3
- Period
- 7
- Electron configuration
- [Rn] 6d² 7s²
- Electronegativity (Pauling)
- 1.3
- Atomic radius
- 180 pm
- First ionization energy
- 587 kJ/mol
- Melting point
- 2115 K (1841.8 °C)
- Boiling point
- 5061 K (4787.9 °C)
- Density
- 11.72 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1829