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Question

The element with electronic configuration of its atom 1s2,2s2,2p6,3s2,3p6,3d10,4s1 is:

A
fe
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B
Co
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C
Ni
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D
Cu
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Solution

The correct option is D Cu

The element with electronic configuration of its atom 1s2,2s2,2p6,3s2,3p6,3d10,4s1 is Cu

Actually its configarartion is 1s2,2s2,2p6,3s2,3p6,3d9,4s2 but for stability i.e completely filled d orbital gives more stability that is the reason why it attains above configaration.

Hence option D is correct.


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