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