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.