why do the strengths of london (dispersion) forces generally increase with increasing molecular size?

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04-11-2022
Chemistry

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why do the strengths of london (dispersion) forces generally increase with increasing molecular size?

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RaunakRanjan RaunakRanjan · Answer 1 · 2022-11-08T03:40:14-05:00

Dipoles produced by skewed electron distribution give rise to dispersion forces.

More electrons are present in larger molecules, which results in more distortions and a greater force.

Atoms and molecules that are bigger and heavier show larger dispersion forces than those that are smaller and lighter. The valence electrons are, on average, farther from the nucleus in a larger atom or molecule than in a smaller atom or molecule. They can more easily create transient dipoles because they are not held as tightly.

What are London dispersion force ?

When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force. The term "induced dipole-induced dipole attraction" is frequently used to describe this effect.

To know about London dispersion force from the link

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