1.

Which of the following has the largest ionic size?A. `F^-`B. `Mg^(2+)`C. `Na^+`D. `O^(2-)`

Answer» Correct Answer - 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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