Determining Molecular Shape

(Polar molecules, Non-polar molecules, etc.)

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Manasvi Paudel 1A
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am

Determining Molecular Shape

Postby Manasvi Paudel 1A » Sun Nov 26, 2017 11:26 pm

Hey guys ! I know that in order to find the molecular shape, you have to draw the lewis structure first, but what if there are different resonance structures? How do you know which lewis structure to use for naming?

Vincent Chiang 1L
Posts: 54
Joined: Fri Sep 29, 2017 7:05 am

Re: Determining Molecular Shape

Postby Vincent Chiang 1L » Sun Nov 26, 2017 11:28 pm

They all should have the same number of each atoms, so I'm pretty sure you can use any, unless I'm not understanding your question right?

Rachel Formaker 1E
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Re: Determining Molecular Shape

Postby Rachel Formaker 1E » Sun Nov 26, 2017 11:30 pm

Since the resonance structures are the same in terms of atom placement and differ only in electron placement, the shapes for different resonance structures will be the same.
Shape depends on the number of regions of electron density, so whether there is a single, double, or triple bond has no effect on the shape of the molecule.
The atoms and lone pairs are in the same places, so the molecular shape will be the same.

Christy Zhao 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Determining Molecular Shape

Postby Christy Zhao 1H » Sun Nov 26, 2017 11:38 pm

"Because single bonds and multiple bonds are treated as equivalent in the VSEPR model, it does not matter which of the Lewis structures contributing to a resonance structure we consider" (pg. 112).

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