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covalent bonds are much stronger than hydrogen bonds covalent bonds have bond energies from about 155 to 1000 kj mol hydrogen bonds usually have bond energies from 20 to 30 kj mol even though some hydrogen fluorine hydrogen bonds can have bond energies greater than 155 kj mol
Covalent bonds are so strong because the electrons are being shared between the atoms. It has to do with stability. The electrons (or, more correctly, electron pairs) that are being shared between the atoms are negative. Each atom has a nucleus that has positive protons. There is then an attraction between the electrons and the protons.