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Q.

Which electronic configuration is not possible?

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a

2p6

b

2d5

c

1s3

d

4d12

answer is Ŋ.

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Detailed Solution

1S3  is not possible because S-orbital can accommodate a maximum of 2 electrons only 2d5  don’t exist, because the minimum n0  value that permits d-orbital to exits is 34d12  is not possible, because d-subshell can accommodate a maximum of 10 electrons only
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