GKFix MCQ Question

What is the primary difference in the electronic configurations of Sm²⁺ and Sm³⁺ ions?

• A. Sm²⁺ has a 4f⁵ configuration (half-filled), while Sm³⁺ has a 4f⁴ configuration
• B. Sm²⁺ has a 4f⁴ configuration, while Sm³⁺ has a 4f⁵ configuration
• C. Sm²⁺ has a 4f⁶ configuration, while Sm³⁺ has a 4f⁵ configuration
• D. Sm²⁺ has a 4f⁵ configuration, while Sm³⁺ has a 5d¹ configuration