LONDON DISPERSION FORCES

LONDON DISPERSION FORCES

London dispersion forces exist in nonpolar molecules. These forces result from temporary
charge imbalances. The temporary charges exist because the electrons in a molecule or ion move
randomly in the structure. The nucleus of one atom attracts electrons form the neighbouring atom. At
the same time, the electrons in one particle repel the electrons in the neighbour and create a short
lived charge imbalance.

These temporary charges in one molecule or atom attract opposite charges in nearby molecules
or atoms. A local slight positive charge δ+ in one molecule will be attracted to a temporary slight
negative charge δ– in a neighbouring molecule.

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