Actinium: electronic configuration and properties
Actinium has atomic number 89 and electronic configuration [Rn] 6d1 7s2. Explore its periodic behaviour and open the interactive atom model.
Open Actinium in 3DKey properties of Actinium
- Symbol
- Ac
- Atomic number
- 89
- Atomic mass
- 227
- Family
- actinoid
- Electronic configuration
- [Rn] 6d1 7s2
- Shell distribution
- 2, 8, 18, 32, 18, 9, 2
- Oxidation states
- 3
- Standard state
- solid
Periodic behaviour
Atomic radius: not experimentally determined. Electronegativity: 1.1. First ionisation energy: 499 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 Actinium.
Related actinoid elements
Frequently asked questions
What is the electronic configuration of Actinium?
Actinium has electronic configuration [Rn] 6d1 7s2, with shell distribution 2, 8, 18, 32, 18, 9, 2.
What are the oxidation states of Actinium?
The listed oxidation states are 3.
How can I view the Actinium atom in 3D?
PracticeNEET's interactive periodic table provides a rotatable schematic atom with accurate electron populations by shell.