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MgCl2 because it has more electrons (due to the Mg over Na). Because of the higher number of electrons, it has higher dispersion forces (attractive forces). This means that more energy (heat) is required to unstick the molecules into a different state of matter.

NaCl, due to complex arrangement and interaction of molecules, can't be easily explained by using simple dispersion, dipole-dipole interaction.

Although NaCl's higher melting point can be explained by its bonding in its crystal lattice arrangement compare to MgCl2.

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Related Questions

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What has a greater boiling point elevation when dissolved at a concentration of 1mol in water with NaCl or MgCl2?

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