Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Which of the following order of atomic / ionic radius is not correct?
A
F < Cl < Br < I
B
Y 3+ > Sr 2+ > Rb +
C
Nb 
Ta
Ta
D
Li > Be > B
Text Solution
Verified by ExpertsThe correct answer is:
B
Atomic radius increases on moving top to bottom in a group due to increasing number of shells. However, it decreasing on moving left to right in a period due to increasing Z eff and addition of electrons to the same shell.
Nb (4d) 
Ta (5d) (due to poor shielding of nuclear charge by 4f electrons).
For isoelectronic species, ionic radius ∝ 
. So correct order is Y 3+ < Sr 2+ < Rb + .
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems