Thallium: electronic configuration and properties
Thallium has atomic number 81 and electronic configuration [Xe] 4f14 5d10 6s2 6p1. Explore its periodic behaviour and open the interactive atom model.
Open Thallium in 3DKey properties of Thallium
- Symbol
- Tl
- Atomic number
- 81
- Atomic mass
- 204.3833(2)
- Family
- metal
- Electronic configuration
- [Xe] 4f14 5d10 6s2 6p1
- Shell distribution
- 2, 8, 18, 32, 18, 3
- Oxidation states
- 1, 3
- Standard state
- solid
Periodic behaviour
Atomic radius: 148 pm. Electronegativity: 2.04. First ionisation energy: 589 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 Thallium.
Related metal elements
Frequently asked questions
What is the electronic configuration of Thallium?
Thallium has electronic configuration [Xe] 4f14 5d10 6s2 6p1, with shell distribution 2, 8, 18, 32, 18, 3.
What are the oxidation states of Thallium?
The listed oxidation states are 1, 3.
How can I view the Thallium atom in 3D?
PracticeNEET's interactive periodic table provides a rotatable schematic atom with accurate electron populations by shell.