Aabha Misra
Last Activity: 6 Years ago
Answer is fourth
Iodine being element of 5 period have larger radii so does it anion. Selium and Bromine are elements of fourth period so their radii are nearly comparable but selium atom having lesser nuclear charge has larger ionic radii so does it anion(in comparison to bromine?
Fluorine and oxygen are element of 2 period. Ionic radii of oxygen is more than fluorine due to less nuclear charge. Hence ionic radii of its anion will be more.