Which of the following pairs of ions have the same electronic configuration?
Correct answer: B. Fe³⁺ , Mn²⁺
- A. Cr³⁺ , Fe³⁺
- B. Fe³⁺ , Mn²⁺
- C. Fe³⁺ , Co³⁺
- D. Sc³⁺ , Cr³⁺
Explanation
First, write the configurations of the neutral atoms: Mn is [Ar]3d⁵4s² and Fe is [Ar]3d⁶4s². To form Mn²⁺, two 4s electrons are lost, leaving [Ar]3d⁵. To form Fe³⁺, two 4s electrons and one 3d electron are lost, also leaving [Ar]3d⁵. They are isoelectronic.
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