Although `Cr^(3+)` and `Co^(2+)` ions have same number of unpaired electrons but the magnetic moment of `Cr^(3+)` is `3.87 B.M`. and that of `Co^(2+)` `4.87` B.M. because….

Explanation

To explain why the magnetic moments of `Cr^(3+)` and `Co^(2+)` ions differ despite having the same number of unpaired electrons, we will analyze the electronic configurations and contributions to the magnetic moment step by step.

### Step-by-Step Solution:

1. **Identify the Electronic Configurations**:
- Chromium (Cr) has an atomic number of 24. Its electronic configuration is:
\[
\text{Cr: } [Ar] 4s^1 3d^5
...