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Which of the following electronic configurations is not possible:

(1) 1s2, 2s2                          

(2)  1s2, 2s2, 2p6   

(3) 3d10 4s2 4p                          

(4)  1s2 2s2 2p2 3s1

Ans:  1s2 2s2 2p2 3s1

 

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