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A dipole moment is created when there is an unequal sharing of electrons between two atoms. You will typically see this when a difference in electronegativity between the two atoms bonded together (for example O and H). The polarity of a molecule depends on whether the dipole moments cancel out or not. So you have to look at the molecular geometry. If the two dipole moments are across from each they will cancel out and the molecule will be nonpolar. But if they aren't then the dipole moments don't cancel out, and the molecule is polar.
a dipole moment happens when there are different charges between atoms. This can happen if one is more electronegative or maybe has a lone pair while the other doesn't. You can look at the shape of the molecule and how the atoms arrange themselves around the central atom to see if the molecule would be polar. If the dipole moments cancel out (go in opposite directions) it would not be polar. If they don't cancel out, it would be. Of course, if there are no dipole moments, it would also be nonpolar.
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