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Polarizability increases with the increase in number of electrons. This is due to the decreased control that the nuclear charge has on the overall charge distribution in the atom. In small atoms, the electron cloud is small and dense, and the electrons have a stronger interaction/attraction with the positively charged nucleus. In large atoms, there is less of an attraction that allows the electrons to be more fluid, thus making it easier to distort the electron cloud and increasing polarizability.
Polarizability gets higher as the number of electrons increases. This is because the nuclear charge has less control over the electrons due to the shielding effect. Therefore, the outer electrons are more easily distorted.
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