A) $ N{a^{+}} $
B) $ A{l^{3+}} $
C) $ {O^{2-}} $
D) $ {N^{+}} $
Correct Answer: D
$ N_7=1s^{2},2s^{2}2p^{3} $
${N^{+}}=1s^{2},2s^{2},2p^{3}$
$ C=1s^{2},2s^{2}2p^{2}. $
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