Answer:
k
br-
o2- ion
Explanation:
a/k ion has a larger size than k+ ion bc of the size of the radius it is always smaller compared to the parent ion .
b/bc it is an anion and it always has a large size compared to the parent ion (the same thing as the first one)
c/both the anions are isoelectornic species .Since the nuclear charge of O2- ions is small,its size is therefore more than the F- ion
