which among the following species has th...

which among the following species has the same number o f electrons in its outermost as well as penultimate shell ?

A

`Mg^(2+)`

B

`O^(2-)`

C

`F^(-)`

D

`Ca^(2+)`

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The correct Answer is:

D

`""_(20)Ca-2,8,8,2`
`Ca^(2+)=2,8,8`
Hence, `Ca^(2+)` has 8 electrons each in outermost and penultimate shell.

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