Building Resonance Structures with Similar Formal Charges

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Ayesha Aslam-Mir 3C
Posts: 113
Joined: Wed Sep 30, 2020 9:43 pm

Building Resonance Structures with Similar Formal Charges

Postby Ayesha Aslam-Mir 3C » Sun Nov 15, 2020 10:23 pm

In building resonance structures with similar distributions of formal charges, how do we determine which is more favorable? I've looked at a few problems with different double/single bonds, same distributions of formal charges, and remember reading somewhere that favorability is influenced by least overall formal charges. I also remember reading that the formal charges need to make sense depending on an atom's individual electronegativity, so I was wondering if anyone would be able to clear that up? Thanks!

Kainalu Puu-Robinson
Posts: 51
Joined: Wed Sep 30, 2020 9:46 pm

Re: Building Resonance Structures with Similar Formal Charges

Postby Kainalu Puu-Robinson » Sun Nov 15, 2020 10:27 pm

As you said, favorability is influenced by the least overall formal charges. I find it easiest to just visually look at the completed Lewis structures with the formal charges and see which one has the least formal charges.

Mahnoor_Wani_1I
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Joined: Wed Sep 30, 2020 9:35 pm
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Re: Building Resonance Structures with Similar Formal Charges

Postby Mahnoor_Wani_1I » Sun Nov 15, 2020 10:29 pm

Least formal charges = more favorable. More electronegative atom should have the negative charge since it attracts electrons. If mot electronegative atom doesn't have the negative charge then its not favorable


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