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Electronegativity is the force of an atom to attract electrons to itself, and Polarity represents the distribution of electron density of a molecule.
When the atoms of a molecule have very different electronegativities, zones with different electron densities are generated, and poles are formed.
So, the role that electronegativity plays in the polariry of a molecule is very important because knowing the electronegativity of atoms we can know if a molecule is polar or nonpolar.