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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
Strong linkagesâcalled covalent bondsâhold together the hydrogen (white) and oxygen (red) atoms of individual H 2 O molecules. Covalent bonds occur when two atomsâin this case oxygen and hydrogenâshare electrons with each other. Because oxygen and hydrogen attract the shared electrons unequally, each end of the V-shaped H 2 O molecule adopts a slightly different charge.