The d-And-f-Block Elements

Short Answer Type

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Why is the following electronic configuration not correct for the ground state of Mo atom? (at. no. = 42).
1s2 2s2 2p6 3s23p63d10 4s2 4p6 4d4 5s2.

Half filled orbitals have extra stability. Therefore, the correct configuration is:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 4d5

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