Property of the alkaline earth metals that increases with their atomic number is

Ionisation potential decreases as atomic radii electronegativity decreases as metallic nature   Hydration energy decreases solubility decreasesHydration energy α SolubilityIn case of large size anion SO4-2,CO3-2 with small change in cation size there is no considerable change in lattice energy and hence in this case solubility depends on the hydration energyTherefore,BeSO4 is highly soluble in waterIn general in all IA group and IIA group compounds except fluorides and hydroxides solubility down the group decreases but the two exceptions are carbonates & bicarbonates of IA group where solubility increases down the group.