MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryAtomic StructureIntro

The number of unpaired d-electrons retained in Fe²⁺ ion (At. no. of Fe = 26) is

0.6

1.3

2.4

3.5

Explanation

Fe: [Ar] 3d⁶ 4s². Fe²⁺: [Ar] 3d⁶. The 3d⁶ configuration: ↑↓ ↑ ↑ ↑ ↑ → 4 unpaired electrons.

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