The electronic configuration of chromium is actually [Ar]3d 5 4s 1 instead of normally…
Chemistry · JEE Main · NTA Exams — d- and f-Block Elements
The electronic configuration of chromium is actually [Ar]3d54s1 instead of normally expected [Ar]3d44s2. This is because
- an exactly half-filled d level gives additional stability, according to the Hund rule of maximum multiplicity
- the 4s orbital has higher energy than the 3d orbitals
- the 4s orbitals has lower energy than the 3d orbitals
- the 3d and 4s orbitals have equal energies and hence electron migration occurs readily
Answer
(A) an exactly half-filled d level gives additional stability, according to the Hund rule of maximum multiplicity
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