GKFix MCQ Question

Why is the hydration enthalpy of Cu2+ considered relatively low?

• A. Because Cu2+ has a small ionic radius.
• B. Because Cu2+ has a low charge density.
• C. Because water molecules do not interact strongly with transition metal ions.
• D. Because the 3d electrons in Cu2+ provide poor shielding, making the effective nuclear charge felt by the incoming water molecules higher.