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

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The solubility of the alkaline earth metal hydroxides in water increases with increase in atomic number down the group. This is due to the reason that both 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 their solubility increases down the group.
$\overset{B e (O H)_{2}, M g (O H)_{2}, C a (O H)_{2}, S r (O H)_{2}}{\to}$

Electronegativity: -
$\to$ On moving top to bottom, $E N ↓$
$\to$ On moving top to bottom, solubility of sulphate in water decreases.
$\to$ On moving top to bottom no. of shells increases so, ionisation energy decreases

Chemistry - Complete s-block Question with Solution | TestHub

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