Question

The electronic configuration of a valance shell of cu is 3d104s1 and not 3d94s2.how is this configuration explanation.
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Answer 1

Answer:

Configuration either exactly half-filled or fully filled orbitals are more stable due to symmetrical distribution of electrons and maximum exchange energy in 3d104s1 d-orbitals are completely filled and s-orbital is half-filled. Hence it is more stable configuration.

Explanation:

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