Chemistry - CHEMICAL BONDING Question with Solution | TestHub

All these compounds are ionic chlorides of Group 2 metals.

Melting point depends on lattice energy, which increases with charge density of the cation.

Be²⁺ is very small and highly polarizing → BeCl₂ has more covalent character.

Covalent compounds have lower melting points than purely ionic compounds.

Down the group (Mg → Ca → Sr), cation size increases → ionic character increases → higher melting points.

Therefore, BeCl₂ has the lowest melting point.