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Q.

Which of the following electronic configurations is not possible

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a

1s22s2

b

1s2 2s2  2p6

c

3d104s24p2

d

1s22s22p2 3s1

answer is D.

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Detailed Solution

When 2p orbital is completely filled then electron enter in the 3s. The capacity of 2p orbital containing e- is 6. So 1s22s22p2 3s2 is a wrong electronic configurationthe right is 1s22s2  2p3.
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