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
Frequently asked questions
What is Thorium?
Thorium (Th) is an actinide, element number 90 on the periodic table. Potential nuclear fuel.
What is the atomic number and atomic mass of Thorium?
Thorium has atomic number 90 and an atomic mass of about 232.04 g/mol.
What is the electron configuration of Thorium?
The electron configuration of Thorium is [Rn] 6d² 7s².
Where is Thorium on the periodic table?
Thorium sits in group 3, period 7, and is classified as a actinide.