The ions `O^(2-), F^(-), Na^(+), Mg^(2+)`, and `A1^(3+)` are isolectronic. Their ionic radii showA. an increase from `O^(2-)` to `F^(-)` and then decrease form `Na^(+)` to `Al^(3+)`B. a decrease form `O^(2-)` to `F^(-)` and then increase form `Na^(+)` to `Al^(3+)`C. a significant increases form `O^(2-)` to `Al^(3+)`D. a significant decrease form `O^(2-)` to `Al^(3+)`

The ions `O^(2-), F^(-), Na^(+), Mg^(2+)`, and `A1^(3+)` are isolectro

1.	The ions `O^(2-), F^(-), Na^(+), Mg^(2+)`, and `A1^(3+)` are isolectronic. Their ionic radii showA. an increase from `O^(2-)` to `F^(-)` and then decrease form `Na^(+)` to `Al^(3+)`B. a decrease form `O^(2-)` to `F^(-)` and then increase form `Na^(+)` to `Al^(3+)`C. a significant increases form `O^(2-)` to `Al^(3+)`D. a significant decrease form `O^(2-)` to `Al^(3+)`
Answer» Correct Answer - D On increasing atomic number of isoelectronic , species ionic radii decreases due to increasing effective nuclear charge `(Z_("eff"))` `"Radius"prop(1)/("Atomic number")prop (1)/(Z_("eff"))` So, as the negative charge increases ionic radii increases while on increasing positive charge ionic radu decreases. Anions having higher ionic radil than the cation `O^(2+) gt F^(-) gt Na^(+) gt Mg^(2+) gt Al^(3+)`

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