A) $ Mg $
B) $ Na $
C) $ Ne $
D) $\mathbf{F}$
Correct Answer: A
$ Mg_{12} $ have $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} $ electronic configuration $ n=3,l=0,m=0,s=-\frac{1}{2} $ .
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