What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms : `3d^(3),3d^(5),3d^(8)`and `3d^(4)`?

Explanation

To determine the stable oxidation states of transition elements with the given d-electron configurations (3d³, 3d⁵, 3d⁸, and 3d⁴), we will analyze each configuration step by step.

### Step 1: Analyze 3d³ Configuration
- The electron configuration can be represented as:
- 4s² 3d³
- To achieve a stable configuration, we can remove all three 3d electrons and both 4s electrons, resulting in:
- Oxidation state = +5 (losing 5 electrons)
- **Stable oxidation state:** +5
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