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How can you determine whether a molecule is color or not before learning about the shape? For example, what is the reason that BF3 is non polar and NF3 is polar. Does it have to do with the lone pair? Sapling explains it in terms of molecular shape, but since we have not covered that yet, I was wondering if there is another explanation.
Yeah, the lone pair in NF3 makes it so that the fluorines are pushed away and thus changes the molecular shape as well so that it is polar/no longer symmetrical. The BF3 has no lone pairs and has a symmetrical shape/is non-polar.
For the example you provided, BF3 is non polar because the polarity/dipole of the 3 B-F bonds all cancel out each other. In the NF3 molecule, the lone pair does not allow this to happen and thus the molecule will overall have a charge and be polar.
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