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A different definition from Lavelle's I used in High school- A Van Der Wall Interaction (London Forces) results from instantaneous (shot lasting) dipoles created by the random movement of electrons in atoms or molecules. The larger an atom or molecule, the more electrons, so the more likely for instantaneous dipoles to form. Two atoms/molecules can be attracted to each other due to these forces.
Van Der Waals Interactions are small, intermolecular attractions caused by the electrical interactions between electrons and protons of near by molecules. They are super weak and on & off. They are, however, interchangeably known as dipole-dipole "moments" because it is the movement of the electrons and the interactions caused by that move that causes small movements of equal and opposite charges existing between the atoms. They are spontaneous and short lived which makes them moments and not complete interactions, but yes, are also called Van Der Waals Interactions.
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