GKFix MCQ Question

What is the primary difference in the electronic configurations of Eu²⁺ and Eu³⁺ ions?

• A. Eu²⁺ has a 4f⁷ configuration, while Eu³⁺ has a 4f⁶ configuration
• B. Eu²⁺ has a 4f⁶ configuration, while Eu³⁺ has a 4f⁷ configuration
• C. Eu²⁺ has a 4f⁸ configuration, while Eu³⁺ has a 4f⁷ configuration
• D. Eu²⁺ has a 4f⁷ configuration, while Eu³⁺ has a 5d¹ configuration