If it's ionic bonding, then some atoms have lost electrons and some have gained electrons - depending on the elements, this generally means higher melting point since there are EM forces of attraction to overcome. That's why ionic compounds are generally solid. Covalent is worse, because those are covalent bonds and it takes insane amounts of energy to break them (or a catalyst, but let's not go there). But between molecules there are only weak bonds if at all, so m.p. and b.p. are low as you're only breaking molecules from each other and not breaking the intramolecular bonds. Etc. That's for one property (mp/bp) and you should be able to do something similar for the rest.
Nov 10th, 2014
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