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A Van der Waals bond is a chemical bond that has a weak attraction due to random disturbances in the electron clouds of adjacent atoms; it is also the weakest of all bonds. A hydrogen bond is a chemical bond that has a weak attraction between polarized molecules. A covalent bond is a chemical bond that shares one or more pairs of electrons between nuclei. An ionic bond is a chemical bond that has a relatively weak attraction between an anion and a cation.