The stability of exactly half-filled and completely filled configuration is due to.........and .........

Explanation

To answer the question regarding the stability of exactly half-filled and completely filled electron configurations, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Electron Configurations**:
- Electron configurations describe the distribution of electrons in an atom's orbitals. Half-filled configurations have half of the orbitals filled, while completely filled configurations have all orbitals filled.

2. **Stability Factors**:
...