Published by:
CGP EDU Academic Team
Published on: August 14, 2026
In which one of the following pairs, the radius of the second species is greater than that of the first?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
and 
both are isoelectronic but differ in the charge possessed by them. As the negative charge increases, the electrons are held less and less tightly by the nucleus, therefore ionic radii increase. Hence, ionic radii of 
is greater than 
.
In a period from left to right, atomic radii decreases but in a group on moving downwards it increases.
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