A) $ N{a^{+}} $
B) $ M{g^{2+}} $
C) $ {O^{2-}} $
D) $ C{l^{-}} $
Correct Answer: D
$ N{a^{+}} $ $ =1s^{2},2s^{2},2p^{6} $
Mg++ $ =1s^{2},2s^{2},2p^{6} $
$ {O^{2-}} $ $ =1s^{2},2s^{2},2p^{6} $
$ C{l^{-}} $ $ =1s^{2},2s^{2},2p^{6}3s^{2}3p^{6} $
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