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Charge distribution refers to which parts of the molecule have more or less electron density than other parts. For example, H2 has a symmetric charge distribution (the charge is distributed equally throughout the whole molecule) because the bonded atoms have the exact same electronegativity so there is no dipole and the molecule is nonpolar. Molecules that have asymmetric charge distribution, where one atom or part of the molecule has a higher concentration of the electron density than the other parts, contain dipole moments, ie a partial positive and a partial negative end, as in H2O.
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