5.1.1 London forces
The distribution of charge in one atom or molecule occurs naturally as the electrons move around the nucleus. If a second atom or molecule is introduced, the charge distribution from the first will induce a complementary charge distribution in the second. Looking at Figure 22 you can see that the negative bias of one molecule will induce a positive bias on the adjacent side of the other. This distribution does not have to remain constant and as the charge moves around on one atom or molecule, the other may respond; so that although no charge is exchanged or shared, an attraction between the two always exists and a weak bond is formed.