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Q.
Which of the following sets will have highest hydration enthalpy and highest ionic radius ?
AMUAMU 2010The s-Block Elements
Solution:
As the atomic/ionic size increases, hydration enthalpy decreases. On moving downwards in a group, since ionic/atomic radii increases, thus hydration enthalpy decreases. Hence, among alkali metals Li has the highest hydration enthalpy while Rb has the highest ionic radius