Which of the following ions should have the most exothermic ΔH_hydration? A) Rb⁺ B) Ba²⁺ C) Al³⁺ D) Sr²⁺ E) Ni²⁺

Question

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The hydration enthalpy (ΔH_hydration) is most exothermic for ions with high charge density. Among the given options, Al^3+ has the highest charge (+3) and a relatively small size, leading to the highest charge density and thus the most exothermic hydration enthalpy.

Which of the Following Ions Should Have the Most Exothermic