VSEPR for four electron densities

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Jessica Yang 1J
Posts: 55
Joined: Fri Sep 29, 2017 7:03 am

VSEPR for four electron densities

Postby Jessica Yang 1J » Mon Nov 13, 2017 12:07 pm

Hi I was wondering how to distinguish between a tetrahedral and a trigonal pyramid. I know both have four electron densities. Also how would hybridization would work differently for the two structures?

K Stefanescu 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:04 am

Re: VSEPR for four electron densities

Postby K Stefanescu 2I » Mon Nov 13, 2017 12:12 pm

Trigonal pyramidal structures have 4 regions of electron density, but one of those regions is a lone pair instead of a bonded atom. In contrast, tetrahedral structures have 4 regions of electron density that are all "attached" to a bonded atom.

I believe that hybridization of the central atom should be the same for either structure, but can anyone confirm this?

Andrea ORiordan 1L
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Joined: Fri Sep 29, 2017 7:04 am
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Re: VSEPR for four electron densities

Postby Andrea ORiordan 1L » Mon Nov 13, 2017 12:55 pm

Yes, the hybridization would be the same. Look at NH3 and NH4+ as examples, and you see that they both have sp3 hybridization. Hybridization does not depend on the number of lone pairs versus the number of bonded atoms- it only depends on regions of electron density, which can be either.


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