NEET Chemistry
Cobalt: electronic configuration and properties
Cobalt has atomic number 27 and electronic configuration [Ar] 3d7 4s2. Explore its periodic behaviour and open the interactive atom model.
Open Cobalt in 3DKey properties of Cobalt
- Symbol
- Co
- Atomic number
- 27
- Atomic mass
- 58.933195(5)
- Family
- transition metal
- Electronic configuration
- [Ar] 3d7 4s2
- Shell distribution
- 2, 8, 15, 2
- Oxidation states
- -1, 1, 2, 3, 4, 5
- Standard state
- solid
Periodic behaviour
Atomic radius: 126 pm. Electronegativity: 1.88. First ionisation energy: 760 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 Cobalt.
Related transition metal elements
Frequently asked questions
What is the electronic configuration of Cobalt?
Cobalt has electronic configuration [Ar] 3d7 4s2, with shell distribution 2, 8, 15, 2.
What are the oxidation states of Cobalt?
The listed oxidation states are -1, 1, 2, 3, 4, 5.
How can I view the Cobalt atom in 3D?
PracticeNEET's interactive periodic table provides a rotatable schematic atom with accurate electron populations by shell.