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Which of the following has the largest i...

Which of the following has the largest ionic size?

A

`F^-`

B

`Mg^(2+)`

C

`Na^+`

D

`O^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Na^(+),Mg^(2+),F^(-) and O^(2-)` are all isoelectronic with 10 electrons each. Nuclear charge on `Na^(+),Mg^(2+) , F^(-) and O^(2-)` are 11,12,9 and 8 respectively.
Lesser the nuclear charge, larger is the ion. Thus `O^(2-)` is largest.
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