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Unformatted text preview: It is significant only when the atoms are close together The ease with which an external electric field can induce a dipole (alter the electron distribution) with a molecule is referred to as the "polarizability" of that molecule The greater the polarizability of a molecule the easier it is to induce a momentary dipole and the stronger the dispersion forces Larger molecules tend to have greater polarizability o Their electrons are further away from the nucleus (any asymmetric distribution produces a larger dipole due to larger charge separation) o The number of electrons is greater (higher probability of asymmetric distribution) thus, dispersion forces tend to increase with increasing molecular mass Dispersion forces are also present between polar/non-polar and polar/polar molecules (i.e. between all molecules)...
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