Question

Write electronic configuration of (Cr24) and (Cu29). Why Cr and Cu shows anomalous electronic configuration

Answer 1

Explanation:

Electronic configuration of Cr and Cu shows anomalous electronic configuration because a completely full or half full d sublevel is more stable than a partially filled d sub level and that is why electrons from 4s orbitals is excited and rises to a 3d orbital. So Cr and Cu show such irregular behaviour

Answer 2

Answer:

The Electronic configuration of Cr and Cu are given below →

1. Cr = 24 = 1s² 2s² 2p6 3s² 4p6 4s¹ 3d5

2. Cu = 29 = 1s² 2s² 2p6 3s² 4p6 4s¹ 3d¹⁰

These electronic configuration are exceptional because electrons entered in 3-d orbitals without filling the 4s orbitals complete.

Reason for the Exceptions → It is said

that d orbitals can be stable if it is half filled or full filled.

Thus, In the given case, electrons reaches near the half filled and full filled thus due to the attraction one electrons from the s orbitals came in d orbitals.

Hope it helps.

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