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Hi Bethany! I would say no because if you have a diatomic molecule such as Br2, in which each Br atom has 3 lone pairs, but it is still a nonpolar molecule. Rather than just looking for lone pairs, I would say to look at the difference in electronegativity to determine polarity :)
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Last edited by Yu Jin Kwon 3L on Sat Nov 28, 2020 11:22 am, edited 1 time in total.
I don’t think you can assume that any molecule with a central atom that has lone pairs is polar. For example, XeF2 is non polar, and it has 3 lone pairs on the central atom. The lone pairs are arranged at 120 degrees to each other and the F-Xe-F bond angle is 180 degrees, so there is a 0 net dipole moment due to this symmetry.
In some molecules, the presence of a lone pair causes the molecule to lose its symmetry, therefore its dipoles would not cancel out causing it to be a polar molecule. But as many have mentioned, lone pairs are not determinedly a factor of polar molecules. It is best to look at how the lone pairs are a factor in molecule shape to determine its polarity.
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