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Question

The ground state electron configuration of Fe is:


  1. 1s2 2s2 2p6 3s2 3p6 4s2

  2. 1s2 2s2 2p6 3s2 3p6 3d8

  3. 1s2 2s3s2 3p3d10

  4. 1s2 2s2 2p6 3s2 3p6 4s3d6


Solution

The correct option is D

1s2 2s2 2p6 3s2 3p6 4s3d6


This is as per the various rules for filling of electrons in various orbitals i.e. Hund's rule of maximum multiplicity, Aufbau principle and Pauli exclusion principle.

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