Van der Waals forces exist among all kinds of atoms and molecules. The origin of vdW force stems from the instantaneous dipole-induced dipole interactions among adjacent apolar atoms and molecules, which can be repulsive or attractive.

Where are van der Waals forces found?

Van der Waals forces, relatively weak electric forces that attract neutral molecules to one another in gases, in liquefied and solidified gases, and in almost all organic liquids and solids.

Where do van der Waals interactions occur?

van der Waals interactions occur when adjacent atoms come close enough that their outer electron clouds just barely touch. This action induces charge fluctuations that result in a nonspecific, nondirectional attraction.