If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to

Since (∈ r - 1) = 4 p NR 3 , electronic polarizability ∝ R 3 .

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Accepted Answer

Since (∈_r - 1) = 4p NR³, electronic polarizability ∝ R³.

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