In Which One Of The Following Pairs The Radius Of The Second Species Is Greater Than That Of The First?

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Question

In which one of the following pairs the radius of the second species is greater than that of the first?

easy

Solution

Correct option is

O^2–, N^3–

O^2– and N^3– 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, radius increases form O^2– to N^3–.