First slide
Periodicity in atomic properties
Question

which ion has the largest radius?

Moderate
Solution

On moving down, the group, atomic radius increases, while it decreases on moving from left to right. Howeve4 for isoelectronic species, the atomic radius decreases with increase in atomic number. Further larger the charge on the anion, greater is their radius. Hence, on considering all the factors, Se2- would possesses larger ionic radius.

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