JEE MAIN - Chemistry (2022 - 27th June Evening Shift - No. 3)

The correct order of increasing ionic radii is
Mg2+ < Na+ < F$$-$$ < O2$$-$$ < N3$$-$$
N3$$-$$ < O2$$-$$ < F$$-$$ < Na+ < Mg2+
F$$-$$ < Na+ < O2$$-$$ < Mg2+ < N3$$-$$
Na+ < F$$-$$ < Mg2+ < O2$$-$$ < N3$$-$$

Explanation

For isoelectronic species

Ionic radii $$\propto \frac{(-) \text { ve charge }}{(+) \text { ve charge }}$$

Hence, correct order of ionic radii is

Mg2+ < Na+ < F– < O2– < N3–

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