Thorium (Th)
A fascinating actinide element.
Thorium is element 90 on the periodic table.
Element properties
- Atomic number
- 90
- Symbol
- Th
- Atomic mass
- 232.04 u
- Category
- Actinide
- Period
- 7
- Group
- Not assigned
- Block
- f
- State
- Solid
- Electron configuration
- [Rn] 6d2 7s2
- Electronegativity (Pauling)
- 1.3
- Density
- 11.7 g/cm³
- Melting point
- 1750 °C
- Boiling point
- 4788 °C