Question

The ionic radii of isoelectronic species are found to be 171 pm, 136 pm & 140 pm respectively. The isoelectronic species are _____ 

(a)  N^3– , O^{2– ,} F^– 

(b)  F^– , O^2– , N^3– 

(c)  O^2– , N^3– , F^– 

(d)  N^3– , F^– , O^2-

Answer 1

The isoelectronic species are  N^3– , F^– , O^2–.