the electronic structure of four elements a b c d


The electronic structure of four elements A, B, C, D are:

(1) 1s2                 

(2) 1s2, 2s2, 2p2,             

(3)  1s2, 2s2, 2p5,                           

(4)  1s2, 2s2, 2p6

Ans:  1s2, 2s2, 2p5,

 

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Chemistry: the electronic structure of four elements a b c d
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