Why do the strengths of London (dispersion) forces generally increase with incre

Question

Why do the strengths of London (dispersion) forces generally increase with increasing molecular size? Dispersion forces are all equal in magnitude; there is no size dependence. Heavier atoms have stronger attractions for each other than lighter atoms. Dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. Dispersion forces depend on distance. Larger molecules are farther apart and so the forces are smaller. Dispersion forces arise from dipoles caused by the electron distribution being distorted. Larger molecules have more electrons and, therefore, more distortions and a bigger force.

Explanation / Answer

Dispersion forces araise from dipoles caused by the electron distribution being distorted.

Larger molecules have more electrons and therefore more distortions and a bigger force.

So last one is the correct option

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