What accounts for the difference in melting points of the substance?
Answer:
All that matters is the strength of the intermolecular bonds in the crystal lattice. If the bonds are strong, then you will have a high melting point.
ionic compounds generally have high melting points, rigid and tightly packed crystal lattice gives the compound a great deal of stability, and yields a higher meting point
the protons, atomic number
Different levels of purity. Impurities disrupt the crystalline lattice of a solid substance and make it easier, therefore, for the substance to melt.
Molecular structure & composition
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