Question

Diamagnetic Lanthanoid ions are:

• A. Nd\(^{3+}\) and Eu\(^{3+}\)
• B. Nd\(^{3+}\) and Ce\(^{4+}\)
• C. La\(^{3+}\) and Ce\(^{4+}\)
• D. Lu\(^{3+}\) and Eu\(^{3+}\)

Answer 1

The Correct Option is C

Step 1. Understand Diamagnetism: Diamagnetic species have all electrons paired, which means the ions should have no unpaired electrons in their electron configuration.

Step 2. Examine Electron Configurations: Ce⁴⁺: [Xe] 4f⁰ - All electrons are paired, hence diamagnetic. La³⁺: [Xe] - Also has no unpaired electrons, hence diamagnetic.

Step 3. Conclusion: La³⁺ and Ce⁴⁺ are both diamagnetic as they lack unpaired electrons.