MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryAtomic StructureIntro

Aufbau principle does NOT give the correct arrangement of filling of atomic orbitals in

0.Cu and Zn

1.Co and Zn

2.Mn and Cr

3.Cu and Cr

Explanation

Cu (Z=29): expected [Ar]3d⁹4s² but actual [Ar]3d¹⁰4s¹ (completely filled d). Cr (Z=24): expected [Ar]3d⁴4s² but actual [Ar]3d⁵4s¹ (half-filled d). Both Cu and Cr deviate from Aufbau.

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