MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryAtomic StructureIntro

The correct ground state electronic configuration of chromium atom (Z = 24) is

0.[Ar] 3d⁵ 4s¹

1.[Ar] 3d⁴ 4s²

2.[Ar] 3d⁶ 4s⁰

3.[Ar] 4s¹ 4p⁵

Explanation

Cr (Z=24) has the exceptional configuration [Ar] 3d⁵ 4s¹ (not [Ar] 3d⁴ 4s²) because half-filled d subshell (3d⁵) is extra stable due to symmetry and exchange energy.

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