Compare the stability of +2 oxidation state for the elements of the first transition series.

Explanation

To compare the stability of the +2 oxidation state for the elements of the first transition series, we can analyze the electronic configurations and the factors affecting stability.

### Step-by-Step Solution:

1. **Understanding the +2 Oxidation State**:
- The +2 oxidation state in transition metals typically involves the loss of two electrons. For the first transition series (Scandium to Zinc), the electron configuration starts with 4s² and then fills the 3d subshell.

2. **Electron Configuration**:
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