Why `E^(-)` values for Mn, Ni and Zn are more negative than expected?

Explanation

To understand why the standard electrode potentials (E°) for manganese (Mn), nickel (Ni), and zinc (Zn) are more negative than expected, we can break down the explanation into several steps:

### Step 1: Understand the Electronic Configurations
- Manganese (Mn) has the electronic configuration of [Ar] 3d^5, which is a half-filled configuration.
- Nickel (Ni) has the electronic configuration of [Ar] 3d^8 4s^2.
- Zinc (Zn) has the electronic configuration of [Ar] 3d^10, which is a fully filled configuration.

### Step 2: Stability of Electronic Configurations
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