# Which one has the highest melting point?A. Ionic crystalB. Molecular crystalC. Covalent crystalD. Metallic crystal

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Hint: Let us get some briefing of melting point. Melting point is the temperature at which a substance exists in equilibrium with its solid and liquid states. A crystal is a solid whose constituents are arranged in high order minute structure thus forming a crystal lattice that extends in all directions.

Note: The melting point of any crystal can be easily determined by its structure. Like, the melting point of the diamond is$\text{355}{{\text{0}}^{o}}\text{C}$. High melting point is because of the presence of strong covalent bonds and formation of a giant three-dimensional network.