Asked by Kate

Why do molecular compounds have low melting points and low boiling points relative to ionic substances?
Answered by DrBob222
Most molecular compounds are composed of discrete molecules whereas ionic compounds are composed of a three dimensional array of ions. To melt an ionic compound the attractive forces of the crystal must be broken. There are some exceptions to this rule; e.g., diamond is very hard but it is composed of carbon in a network of covalent bonds.
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