Which of the following ion has the highest value of ionic radius?

1.	Which of the following ion has the highest value of ionic radius?
Answer» `Li^(+)` `F^(-)` `O^(2-)` `B^(+)` Solution :Ionic radius decreases in a group from top to BOTTOM. `O^(2-) " and " F^(-)` have larger size than `Li^(+)" and " B^(+)` `O^(2-)" and " F^(-) ` are isoelectronic, but `O^(2-)` has smaller nuclear CHARGE (8) than `F^(-)` (g) ,As an effect of less EFFECTIVE nuclear charge `O^(2-)` has higher ionic radius.

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