Q. The ionic radii (Å) of $C^{4 -}and\ O^{2 -}$ respectively are 2.60 and 1.40. The ionic radius of the isoelectronic ion $N^{3 -}$would be
A) 2.6
B) 1.71
C) 1.4
D) 0.95
Explanation
(b)
$C^{4 -},N^{3 -}and\ O^{2 -}$are isoelectronic species. The ionic radius of isoelectronic species decreases with increase the nuclear charge. Hence, the order of ionic radius is
Species $C^{4 -}$ > $N^{3 -}$ > $O^{2 -}$
Ionic radii(Å) 2.60 1.71 1.40
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.