The ionic radii of O2–, F–, Na+ and Mg2+ are in the order : (A) O2– F– Na+ Mg2+ (B) F– O2– Na+ Mg2+ (C) O2– F– Mg2+ Na+ (D) Mg2+ Na+ F– O2–

Question

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

(A) O2– > F– > Na+ > Mg2+
(B) F– > O2– > Na+ > Mg2+
(C) O2– > F– > Mg2+ > Na+
(D) Mg2+ > Na+ > F– > O2–

Prashant Kotian · Accepted Answer

Correct answer: A. O2– F– Na+ Mg2+ Z 9 12 No. of e– 10 10 In isoelectronic species greater is Z smaller is radius so order is O2– > F– > Na+ > Mg2+.

💡 Solution & Explanation