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VSEPR and Lewis

Posted: Sun May 27, 2018 6:49 pm
by Moris 1H
How can we identify the VSEPR of a molecule from its Lewis structure?

Re: VSEPR and Lewis

Posted: Sun May 27, 2018 6:56 pm
by Amanda 1A
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.

Re: VSEPR and Lewis

Posted: Sun May 27, 2018 7:51 pm
by Ashley Martinez 1G
When working with VSEPR models I read that it doesn't matter which resonance Lewis structure we consider, can someone explain why this is?

Re: VSEPR and Lewis

Posted: Sun May 27, 2018 7:54 pm
by Taizha 1C
@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.

Re: VSEPR and Lewis

Posted: Sun Jun 03, 2018 10:19 pm
by Ashley Martinez 1G
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.