NEET Chemistry
Iodine: electronic configuration and properties
Iodine has atomic number 53 and electronic configuration [Kr] 4d10 5s2 5p5. Explore its periodic behaviour and open the interactive atom model.
Open Iodine in 3DKey properties of Iodine
- Symbol
- I
- Atomic number
- 53
- Atomic mass
- 126.90447(3)
- Family
- halogen
- Electronic configuration
- [Kr] 4d10 5s2 5p5
- Shell distribution
- 2, 8, 18, 18, 7
- Oxidation states
- -1, 1, 3, 5, 7
- Standard state
- solid
Periodic behaviour
Atomic radius: 133 pm. Electronegativity: 2.66. First ionisation energy: 1008 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 Iodine.
Related halogen elements
Frequently asked questions
What is the electronic configuration of Iodine?
Iodine has electronic configuration [Kr] 4d10 5s2 5p5, with shell distribution 2, 8, 18, 18, 7.
What are the oxidation states of Iodine?
The listed oxidation states are -1, 1, 3, 5, 7.
How can I view the Iodine atom in 3D?
PracticeNEET's interactive periodic table provides a rotatable schematic atom with accurate electron populations by shell.