Polarising action of `Cd^(2+)` on anions is stronger than that of `Ca^(2+)` because

Options

A. the charges of the ions are same
B. their radii are nearly the same
C. the `Ca^(2+)` ion has a noble-gas electron configuration, and the `Cd^(2+)` ion, an 18-electron configuration of its outer shell
D. all of the above are correct

Answer

C

Explanation

the `Ca^(2+)` ion has a noble-gas electron configuration, and the `Cd^(2+)` ion, an 18-electron configuration of its outer shell