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Electron distortion is when the electrons of the anion are attracted to the cation, which causes the shape of the electron density to change slightly. Polarizability occurs when atoms and ions with electron clouds undergo a distortion. Atoms and ions with large distortions are highly polarizable. Electronic distortion is proportional to the polarizability of the electron.
Polarizability is how easily an element can be distorted. It depends on the number of electrons and the size of the atom or molecule. The more electrons an atom has, the more polarizable it is because the nuclear charge of the atom has less of an effect. As polarizability increases, dispersion forces (intermolecular force) become stronger - which causes boiling points of the molecules to increase.
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