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Given below is the electronic configurat...

Given below is the electronic configuration of elements A,B,C,D: (A) `1s^2 2s^2,(B)1s^2 2s^2 2p^6 3s^2,(C)1s^2 2s^2 2p^6 3s^2 3p^3,(D)1s^2 2s^2 2p^6`, Which are the ones coming within the same group?

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A and B i.e., Be and Mg coming within the same group . They have same valence subshell with same valency `(2s ^(2) and 3^(2) ` ) ]
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