Resonance

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Diana A 2L
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Joined: Sat Aug 17, 2019 12:16 am
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Resonance

Postby Diana A 2L » Sun Nov 24, 2019 11:59 pm

When writing a resonance structure, do we do the resonance of the Lewis structure with the best balance of formal charges, or are the structures with imbalanced formal charges that are still correct also count as resonance?

Angus Wu_4G
Posts: 102
Joined: Fri Aug 02, 2019 12:15 am

Re: Resonance

Postby Angus Wu_4G » Mon Nov 25, 2019 12:03 am

Only structures with the best balance of formal charges count as resonance. Keep in mind that you want the most electronegative element in your molecule to carry the negative formal charge, and the least electronegative element to carry the positive formal charge. It is ideal if all the formal charges can be zero though.

Laura WM 3I
Posts: 31
Joined: Wed Sep 18, 2019 12:19 am

Re: Resonance

Postby Laura WM 3I » Mon Nov 25, 2019 12:05 am

It it better to have 2 formal charges of -1 or 1 formal charge of -2?

ZainAlrawi_1J
Posts: 71
Joined: Sat Aug 24, 2019 12:16 am

Re: Resonance

Postby ZainAlrawi_1J » Mon Nov 25, 2019 11:24 am

2 charges of 1 or -1 is usually preferable.

Natalie Benitez 1E
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

Re: Resonance

Postby Natalie Benitez 1E » Mon Nov 25, 2019 1:06 pm

Laura WM 3I wrote:It it better to have 2 formal charges of -1 or 1 formal charge of -2?

This depends on the element itself. If one element is more electronegative compared to the other then you should place the negative charge on the element with the higher electronegativity.

Anna Heckler 2C
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Resonance

Postby Anna Heckler 2C » Mon Nov 25, 2019 5:44 pm

When drawing resonance structures, you still only want the lewis structures with the most "well balanced" formal charges. Note that the negative charge should always go on the most electronegative atom.


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