The crystaline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts. Why?

Alkaline earth metals show:-

Alkali metals salts are

Alkali metals contain

The ionisation enthalpy of alkaline earth metals is

The incorrect statement for alkaline earth metals is

The atomic radii of alkaline earth metals are smaller than those of the corresponding alkali metals. Explain, why?

The most electronegative alkaline earth metal is

The least abundant alkaline earth metal is

(a) Why alkaline earth metals are harder, have higer melting ponts and higher densities than the alkali metals? (b). Why the atoms of alkaline earth metals are smaller than the corresponding alkali metals? (c ). Why alkaline earth metals have high electrical and thermal conductivities? (d). What is black ash? (e). Why the variation in physical properties of alkaline earth elements is not as regular as in the case of alkali metals?

Which of the following salts does not contain water of crystallisation?