JEE MAIN - Chemistry (2020 - 4th September Morning Slot - No. 17)

The ionic radii of O2–, F, Na+ and Mg2+ are in the order :
F > O2– > Na+ > Mg2+
Mg2+ > Na+ > F > O2–
O2– > F > Mg2+ > Na+
O2– > F > Na+ > Mg2+

Explanation

Among isoelectronic species, greater the Zeff smaller will be the radius.

Order of Zeff : Mg2+ > Na+ > F > O2–

Order of Ionic Radii : O2– > F > Na+ > Mg2+

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