Question

Consider the isoelectronic species, Na⁺, Mg²⁺, F^– and O^2–. The correct order of increasing length of their radii is _________.

(i) F^- < O^2– < Mg²⁺ < Na⁺

(ii) Mg²⁺ < Na⁺ < F^– < O^2–

(iii) O^2– < F^– < Na⁺ < Mg²⁺

(iv) O^2– < F^– < Mg²⁺ < Na⁺

Answer 1

(ii) Mg²⁺ < Na⁺ < F^– < O^2–