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Molecules can be attracted to each other due to a variety of intermolecular forces.

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The weakest types of attractions between moleculesdispersion forces and dipole interaction are called van der Waals forces.

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The weakest of all molecular interactions, called dispersion forces or London dispersion forces, are caused by the motion of electrons.

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Hydrogen is a nonpolar molecule, and the electrons are evenly distributed. However, electrons shift around in molecules.

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A weak electrostatic attraction forms between partial positive and partial negative ends of the temporary dipoles. The attraction breaks up when electrons move again.

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are intermolecular attractions between oppositely charged regions of polar molecules