Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Which of the following order of atomic / ionic radius is not correct ?
A
F <Cl< Br <I
B
Y3+>Sr2+>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 Zeff 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 Y3+ < Sr2+ < Rb+.
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