Recall that the random motion of electrons occasionally leads to temporary distortions in the electron distribution creating a separation of charge within the atom. This can then interact with the electrons of neighboring atoms to induce a separation of charge in that atom. This attractive force decreases the potential energy of the system.

Did you include this information in your previous explanation? If not, please revise your explanation to take this into account. $($Note: if you feel your explanation is already sufficient, proceed to the next slide$)$

Why do you think the atoms approach?