Molecules are held together in a crystal by

Hydrogen bond

Electrostatic attraction

Dipole-dipole attraction

Van der Waals forces include attraction and repulsions between atoms , molecules and surfaces , as well as other intermolecular forces .
Unlike ionic or covalent bonds , these attractions do not result from a chemical electronic bond ; they are comparatively weak and therefore more susceptible to disturbance .
The Van der Waals force quickly vanishes at longer distances between interacting molecules .

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