Thorium: electronic configuration and properties
Thorium has atomic number 90 and electronic configuration [Rn] 6d2 7s2. Explore its periodic behaviour and open the interactive atom model.
Open Thorium in 3DKey properties of Thorium
- Symbol
- Th
- Atomic number
- 90
- Atomic mass
- 232.03806(2)
- Family
- actinoid
- Electronic configuration
- [Rn] 6d2 7s2
- Shell distribution
- 2, 8, 18, 32, 18, 10, 2
- Oxidation states
- 2, 3, 4
- Standard state
- solid
Periodic behaviour
Atomic radius: not experimentally determined. Electronegativity: 1.3. First ionisation energy: 587 kJ/mol. Use these values comparatively across a period or group rather than memorising them in isolation.
NEET exam focus
For NEET, prioritise the NCERT electronic configuration, periodic position, common oxidation states, and direct trend-based comparisons involving Thorium.
Related actinoid elements
Frequently asked questions
What is the electronic configuration of Thorium?
Thorium has electronic configuration [Rn] 6d2 7s2, with shell distribution 2, 8, 18, 32, 18, 10, 2.
What are the oxidation states of Thorium?
The listed oxidation states are 2, 3, 4.
How can I view the Thorium atom in 3D?
PracticeNEET's interactive periodic table provides a rotatable schematic atom with accurate electron populations by shell.