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Larger atoms have more electrons in higher energy levels. As a result, electrons are not bound as tightly to the nucleus and each atom will have a larger electron cloud. Because electrons are loosely attracted to the nucleus, it's easier for them to shift around, so electron clouds are more easily distorted. This shifting of electrons leads to an induced dipole moment, resulting in stronger intermolecular forces.
Also, the distortion is describing the electron cloud of a bond. So, if more loosely held electrons (probably big ions they have lots of shells for shielding) are present, a cation will pull those electrons into the space between the two ions more, distorting the electron cloud.
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