Which pair of ions has the same 3d electronic configuration?
Correct answer B. Mn²⁺ and Fe³⁺
Explanation
Mn²⁺ (25 − 2 = 23 electrons) and Fe³⁺ (26 − 3 = 23 electrons) are both [Ar]3d⁵. Fe²⁺ is 3d⁶, Cr³⁺ is 3d³, Cu²⁺ is 3d⁹ and Zn²⁺ is 3d¹⁰.
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