enthalpy of hydration → amount of heat released when an ion is hydrated
M2+ (g) + mH2O → M2+ (aq)
↑ atomic number → ↑ ionic size → ↓ enthalpy of hydration
–3 > –2 > –1 > 0 > +1 > +2 > +3
Rank these ions by their expected hydration energy (from lowest to highest).
Ga3+ , Ca2+ , K+
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