Which of the following electronic configuration, Chemistry

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Which of the following electronic configuration is not possible:

(1)  1s2 2s2                          

(2)  1s2 2s2  2p6                  

(3) [Ar]3d10 4s2 4p2                       

(4) 1s2 2s 2p2 3s1

Ans: 1s2 2s 2p2 3s1

 


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