Question

The change of an anion is always larger than that of parent atom

Answer 1

The radius is larger cause the anion contains more electrons than the protons thus it becomes difficult for the protons to hold a greater number of electrons with the same force.

Thus the force reduces and size increases

Answer 2

Answer:

(1) An anion is formed by the acceptance of an electron by a parent atom.

A + e^- → A^-

(2) The nuclear charge in a parent atom and its anion is same.

(3) The additional electron in an anion, results in the repulsion among the electrons and results in the decrease in effective nuclear charge, as compared to the parent atom. Therefore, the radius of an anion is larger than its parent atom. For example, F atom has atomic radius 64 pm while anion F has ionic radius 136 pm