Hydration Energy Order of Alkali Metals

[gracy]

https://www.toppr.com/iit-jee/chemistry/s-block-elements/cheatsheet/
in this under sub heading properties of alkali metals third definition hydration of ions
it is written as Smaller size of cation, larger is the extent of hydration and hydration energy order is-
Cs+>Rb+>K+>Na+>Li+
but according to the table cs cation has greatest radius so hydration energy should be least but the order shows different story.

 

[Borek]

Smaller size of cation, larger is the extent of hydration and hydration energy order is-
Cs+>Rb+>K+>Na+>Li+

Technically it is correct - hydration enthalpies are always negative, and -264 kJ/mol (for Cs⁺) > -520 kJ/mol (for Li⁺)

But I doubt that's what they meant, you are right, the list should be reversed.