First proposed in 1930, they can exist because instantaneous distributions of electrons about a nucleus need not be spherical
First proposed in 1930, they can exist because instantaneous distributions of electrons about a nucleus need not be spherically symmetric. Thus, for example, both electrons in a helium atom can be on the same side of the nucleus at the same moment, creating an instantaneous dipole moment that results in—for 10 points—what intermolecular forces between nonpolar molecules?
First proposed in 1930, they can exist because instantaneous distributions of electrons about a nucleus need not be spherically symmetric.
{London} or London {dispersion} forces