Which of these ions has the largest number of unpaired electrons?
Correct answer B. Mn²⁺
Explanation
Mn²⁺ is 3d⁵ with five unpaired electrons, Fe²⁺ (3d⁶) has four, Cu²⁺ (3d⁹) has one and Zn²⁺ (3d¹⁰) has none.
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