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On problem 2.25 part b, it asks whether the NF bond in NF3 or the PF bond in PF3 is longer. Since both Lewis structures are pretty much the same besides the central atom, is the PF bond in PF3 longer than the NF bond because P is less electronegative than N, and therefore pulls in the shared electrons from Fluorine less tightly?
Yes, you can also think of it in terms of atomic radius. Since phosphorus has more electrons, its electron cloud (and as a result its atomic radius) is larger than nitrogen. Since distance between the two atoms is greater, we know the bond length will also be greater.
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