The 3d-orbitals are filled at zinc with electronic configuration of

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[Ar]3d104s1

[Ar]3d104s2

[Ar]3d94s3

[Ar]3d84s2

answer is B.

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Detailed Solution

The 3d-orbitals are filled at zinc (Z = 30) with electronic configuration = 1s2,2s22p6,3s23p63d10,4s2

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