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Structure of Atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
Question
Why is following electronic configuration not correct for ground state of Cr atom?
(Atomic number = 24) 1s2 2s2 2p6 3s2 3p6 4s2 3d4.
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Answer

The electronic configuration of Cr(24) in ground state is,

1s2 2s2 2p6 3s2 3p6 4s1 3d5 because half-filled orbitals are more stable.

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