Property of the alkaline earth metals that increases with their atomic

1.	Property of the alkaline earth metals that increases with their atomic number is
Answer» solubility of their hydroxide in water solubility of their sulphates in water ionization energy electronegativity Solution :Solubility of hydroxides of ALKALINE earth metals increases because both the lattice enthalpy and hydration enthalpy decrease down the GROUP as the size of the cation increases but lattice enthalpy DECREASES more rapidly than the hydration enthalpy and hence the solubility increases down the group . Among sulphates , since the size of `SO_(4)^(2-)` ion is very big as compared to the metal cation , therefore , lattice enthalpy remains almost constant but their hydration enthalpy decreases down the group . Thus , the solubility of sulphates decreases down the group . Of course , ELECTRONEGATIVITYAND ionization enthalpy both decrease down the group as the atomic size increases .

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