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What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory?

1. t2g4eg2
2. t2g6eg0
3. eg2t2g4
4. eg4t2g2

Correct answer: t2g6eg0

Solution

In K4[Fe(CN)6], Fe is in the +2 oxidation state (Fe2+). The electronic configuration of Fe2+ is [Ar] 3d6. CN⁻ is a strong field ligand, causing a large crystal field splitting, which pairs up all six d-electrons in the t2g orbitals, resulting in t2g6eg0.

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