Q.
The ionic radii (A˚) of C4− and O2− respectively are 2.60 and 1.40. The ionic radius of the isoelectronic ion N3− would be
7514
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Classification of Elements and Periodicity in Properties
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Solution:
The ionic radii of isoelectronic ions decrease with the increase in the magnitude of the nuclear charge.
So, decreasing order of ionic radii is C(4−)gtN(3−)gtO(2−)