Homework 2.25

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Leslie Cheng 4B
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Joined: Fri Sep 28, 2018 12:29 am

Homework 2.25

Postby Leslie Cheng 4B » Tue Nov 13, 2018 10:29 pm

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?

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Joined: Fri Sep 28, 2018 12:16 am

Re: Homework 2.25

Postby 2c_britneyly » Tue Nov 13, 2018 11:07 pm

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.

Xiangkun Shi 3E
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Joined: Fri Sep 28, 2018 12:25 am

Re: Homework 2.25

Postby Xiangkun Shi 3E » Tue Nov 13, 2018 11:24 pm

Yes, the reasoning from the electronegativity and strength of attraction perspective is the best way to explain this problem.

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