Why is the 3rd ionization energy of Mn (Z = 25) is unexpectedly high ?

Explanation

To understand why the third ionization energy of manganese (Mn) is unexpectedly high, we need to analyze its electronic configuration and the stability associated with half-filled orbitals.

### Step-by-Step Solution:

1. **Identify the Atomic Number and Electronic Configuration**:
- Manganese (Mn) has an atomic number of 25.
- The electronic configuration of Mn is:
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