VSEPR and Lewis

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

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Moris 1H
Posts: 33
Joined: Fri Apr 06, 2018 11:01 am

VSEPR and Lewis

Postby Moris 1H » Sun May 27, 2018 6:49 pm

How can we identify the VSEPR of a molecule from its Lewis structure?

Amanda 1A
Posts: 31
Joined: Fri Apr 06, 2018 11:01 am

Re: VSEPR and Lewis

Postby Amanda 1A » Sun May 27, 2018 6:56 pm

first, identify the central atom and its valence electrons. Then, add an electron for each bonding atom, and add or subtract for the charge (- or +) to get the total number of electrons. Divide the total by 2 to find the total number of electron pairs and use that to identify the basic VSEPR shape.

Ashley Martinez 1G
Posts: 26
Joined: Fri Apr 06, 2018 11:03 am

Re: VSEPR and Lewis

Postby Ashley Martinez 1G » Sun May 27, 2018 7:51 pm

When working with VSEPR models I read that it doesn't matter which resonance Lewis structure we consider, can someone explain why this is?

Taizha 1C
Posts: 36
Joined: Fri Apr 06, 2018 11:01 am

Re: VSEPR and Lewis

Postby Taizha 1C » Sun May 27, 2018 7:54 pm

@Ashley, because single bonds and multiple bonds are treated as equivalent in the VSEPR model, it doesn't matter which of the Lewis Structures contributing to a resonance structure we consider.

Ashley Martinez 1G
Posts: 26
Joined: Fri Apr 06, 2018 11:03 am

Re: VSEPR and Lewis

Postby Ashley Martinez 1G » Sun Jun 03, 2018 10:19 pm

Taizha 1C wrote:@Ashley, because single bonds and multiple bonds are treated as equivalent in the VSEPR model, it doesn't matter which of the Lewis Structures contributing to a resonance structure we consider.

I see. Are they considered equivalent due to a rule that explicitly states this? Thanks in advance.


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