Why is europium (II) more stable than cerium (II) ?

Explanation

To understand why europium (II) is more stable than cerium (II), we can analyze their electronic configurations and the stability associated with them.

### Step-by-Step Solution:

1. **Identify the Electronic Configurations**:
- For **Europium (Eu)** in the +2 oxidation state, the electronic configuration is:
- \( \text{Xe} \, 4f^7 \, 5d^0 \)
- For **Cerium (Ce)** in the +2 oxidation state, the electronic configuration is:
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