Question

The ionic radius of Cs⁺ is ________ than the atomic radius of Cs, and the ionic radius of I^- is ________ than the atomic radius of I.

Answer 1

When Cs+ forms from Cs, an electron is lost.

So, there is less electron-electron repulsion and hence size decreases

So, Cs+ is smaller than Cs

When I- forms from I, an electron is added.

So, there is more electron-electron repulsion and hence size increases

So, I- is larger than I

Answer:

Cs+ is less than Cs

I- is more than I