4 public questions tagged with this topic.
Hydration enthalpy increases with smaller ionic size and higher charge density. Be²⁺ (smallest in group 2) has the highest hydration enthalpy compared to Mg²⁺, Ca²⁺, or Sr²⁺.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Second ionization enthalpy for group 2 elements involves removing an electron from X+ (noble gas-like). Be⁺ (smallest size) has the highest value due to greater nuclear attraction.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks
Hydration energy increases with smaller cation size and higher charge density. Be²⁺ (smallest) has the highest hydration energy among Be, Mg, Ca, and Sr.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
