Ionic compounds have high melting and boiling points. This is due to :
the presence of strong electrostatic forces between ions in the crystal lattice.
Ionic compounds consist of oppositely charged ions held together in a rigid crystal lattice by strong electrostatic (Coulombic) forces of attraction. Overcoming this strong ionic bonding to separate the ions requires a large amount of energy, which is why ionic compounds have high melting and boiling points. Weak van der Waals forces and delocalized electrons describe molecular solids and metals respectively, not ionic solids, and lower lattice energy would lower, not raise, these points.
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