A) \[M{{g}^{2+}}\]
B) \[{{\text{O}}^{2-}}\]
C) \[{{F}^{-}}\]
D) \[C{{a}^{2+}}\]
Correct Answer: D
Solution :
\[_{20}\,Ca=2,8,8,2\] \[C{{a}^{2+}}=2,8,8\] Hence, \[\text{C}{{\text{a}}^{\text{2+}}}\]has 8 electrons each in outermost and penultimate shell.
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