GKFix MCQ Question

Why do Mn, Ni, and Zn have more negative E°(M2+/M) values than expected from the general trend?

• A. Because they have lower ionization enthalpies than their neighbors.
• B. Because they have higher hydration enthalpies than their neighbors.
• C. Because they are less abundant than their neighbors.
• D. Due to factors related to their specific electronic configurations leading to more stable M2+ ions or more favorable hydration.