The relative melting points for each of the solids, and rank them in decreasing order Graphite> sodium chloride> solid ammonia.
More energy is required to overcome them the strong the forces of interaction between the particles are. The melting point rises with increasing energy demand. Thus, a crystalline solid's melting temperature serves as a barometer for stability of it's own lattice.
A solid's freezing temperature is a physical characteristic that can be used to identify a substance. In reality, a solid typically melts across a wide temperature range as opposed to at a single, set temperature. For this reason, speaking of a range of melting point is more useful.
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