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