GKFix MCQ Question

Which of the following species are isoelectronic with each other: O²⁻, F⁻, Na⁺, Mg²⁺?

• A. Only O²⁻ and F⁻
• B. Only Na⁺ and Mg²⁺
• C. Only F⁻ and Na⁺
• D. All of them