Q. In which of the following crystals of ionic compounds would you expect maximum distance between the centres of cotions and anions
A) LiF
B) CsF
C) $CsI$
D) $LiI$
Explanation
(c)
Ionic radii is the distance between the nucleus of an ion and a point upto which the nucleus has its influence on its electron cloud.
The size of ions increases on moving from top to bottom in a group. Hence, the maximum distance between the centres of cations and anions is in CsI because Cs is the largest cation and I is the largest anion.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.