Alkaline earth metals have lower melting point than correspondig alkali metals.

Alkaline earth metal having least melting point is

(a). Which alkaline earth metals do not give characteristic colour to the Bunsen flame? (b). Why alkaline earth metals do not form tripositive ions? (c ). Why alkaline earth metals are diamagnetic, but alkali metals are paramagnetic? (d). Why the first inonisation enthaply pf alkaline earth matals is higher than those of corresponding alkali metals? (e). Why alkaline earth metals are less electropositive than corresponding alkali metals?

The second ionisation enthalpies of alkaline earth metals are much lower than those of the corresponding alkali metals. Explain.

(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?

The alkaline earth metals have smaller size than those of corresponding alkali metals, this is due to

Second ionisation energies of alkaline earth metals are ________ than that of corresponding alkali metals.