Question

select from the following groups an atom or ion which has the largest radius giving proper reason: 1) Fe,Fe2+,Fe3+ 2) S2-,Ar,K+​

Answer 1

In 1st

Fe has the largest radius because

Fe2+ & Fe3+ donates their electrons

from their valance shell due to which their atomic radius is smaller.

K+ has the largest radius because it lies in the 1st group and we know that group 1st has the largest radius of their respective period or as we move from left to right size of atom decrease