Polarizing power ` Cd^(2+)` on the anions is stronger then that of `Ca^(2+)` ion. This is because

Options

A. atomic number of Cd is greater than that of Ca
B. atomic mass of Cd is greater than that Ca
C. size of `Cd^(2+) `ion is larger than that of `Ca^(2+)` ions
D. `Ca^(2+)` ions has noble gas configuration white `Cd^(2+)`ion has pseudo noble gas configuration with
18 electrons in its outer shell

Answer

To understand why the polarizing power of the `Cd^(2+)` ion is stronger than that of the `Ca^(2+)` ion, we can analyze the factors affecting polarizing power.

### Step-by-Step Solution:

1. **Understanding Polarizing Power**:
- Polarizing power refers to the ability of a cation to distort the electron cloud of an anion. The greater the polarizing power, the more it can distort the electron cloud of the anion, leading to covalent character in the bond.

2. **Charge Density Consideration**:
- Polarizing power is influenced by the charge density of the cation, which is determined by the charge of the ion and its size. A higher charge and a smaller ionic radius lead to a greater charge density.

3. **Comparison of `Cd^(2+)` and `Ca^(2+)`**:
- Both `Cd^(2+)` and `Ca^(2+)` have a +2 charge. However, the ionic radii of these ions differ due to their positions in the periodic table.

4. **Ionic Radii**:
- `Ca^(2+)` (Calcium ion) has a larger ionic radius compared to `Cd^(2+)` (Cadmium ion). This is because calcium is in the 4th period, while cadmium is in the 5th period and has a filled d-subshell which affects its size.

5. **Effective Nuclear Charge**:
- Cadmium has a higher effective nuclear charge due to its greater number of protons (48 for Cd compared to 20 for Ca). This results in a stronger attraction between the nucleus and the electrons, leading to a smaller ionic radius for `Cd^(2+)`.

6. **Conclusion**:
- Since `Cd^(2+)` has a smaller ionic radius and a higher charge density compared to `Ca^(2+)`, it has a greater polarizing power. Therefore, `Cd^(2+)` can more effectively distort the electron cloud of anions than `Ca^(2+)`.

### Final Answer:
The polarizing power of `Cd^(2+)` on the anions is stronger than that of `Ca^(2+)` ion because `Cd^(2+)` has a smaller ionic radius and a higher effective nuclear charge, leading to greater charge density.