Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If four elements with atomic numbers 
and 
are forming isoelectronic ions, the atomic number of the ion having largest size is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For an isoelectronic species, the species with more electrons with respect protons in nucleus has larger size. If ' 
' represents number of protons in a nucleus. then, 
has least number of protons, whereas 
has maximum number of protons.
Hence, order of size for isoelectronic species will 
Element with atomic number 
is of largest size and option is the correct answer.
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