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(B) The melting point of alkali metal halides is primarily determined by their lattice energy and the nature of the bond (ionic vs covalent).$LiCl$ ha

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$NaCl$

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(B) The melting point of alkali metal halides is primarily determined by their lattice energy and the nature of the bond (ionic vs covalent).$LiCl$ has high lattice energy but exhibits significant covalent character due to the small size of the $Li^+$ ion (Fajans' rule),which lowers its melting point.$NaCl$ is predominantly ionic and possesses a very high lattice energy,making it the alkali metal chloride with the highest melting point among the given options.As we move down the group from $Na$ to $Rb$,the size of the alkali metal cation increases,which leads to a decrease in lattice energy and consequently a decrease in the melting point.Therefore,$NaCl$ has the highest melting point.

Based on lattice energy and other considerations,which one of the following alkali metal chlorides is expected to have the highest melting point?

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