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Dipoles do not occur between atoms of the same element; dipoles are due to an uneven distribution of electrons, so one atom must possess a different distribution than the other. Dipoles occur between two different nonmetals that are unevenly sharing electrons.
There would not be a dipole difference between the same elements because there is zero dipole difference due to the fact that they both have the same electronegativity. However, molecules that are not diatomic like CO2 can have dipole moments despite being nonpolar.
Molecules like O2 ad Br2 and F2 etc. do not have dipoles. This is because they have the same electronegativity so each atom pulls the electrons an equal amount towards their own nucleus. Dipoles occurs when an atom pulls the electrons towards it more than another atom
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