Resonance Structures

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Soumya Ravichandran 4H
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Resonance Structures

Postby Soumya Ravichandran 4H » Sun Nov 11, 2018 1:10 pm

Does the concept of resonance structures only apply to shifting the strength (double/triple) bonds around the atom, or can it also apply to the shifting of the lone pairs?

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Re: Resonance Structures

Postby Mahir_Hasan2C » Sun Nov 11, 2018 1:27 pm

I think it is possible but we would have to check the formal charge and if the number of electrons matches with the chemical formula.

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Re: Resonance Structures

Postby 505095793 » Sun Nov 11, 2018 3:41 pm

In resonance structures, the bond is shifted to different configurations, and this can change the lone pairs of the surrounding atoms. For example, carbonate has a resonance structure where one of the outer oxygen molecules has a double bond, while the other two oxygens have single bonds. This double bond can be shifted from each oxygen molecule in the Lewis structure and in doing so the lone pairs are also changed because the oxygen with the double bond only has two lone pairs. The other two oxygens have three lone pairs. Therefore this is a situation where both the bond and lone pair changes.

Angel Chen 2k
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Joined: Fri Sep 28, 2018 12:20 am

Re: Resonance Structures

Postby Angel Chen 2k » Sun Nov 11, 2018 11:31 pm

In the resonance structures, only electrons are pushed or shifted. I guess what you said "double or triple bonds are shifted" means the electrons that constitute the pi bond(s) are shifted. In this way, the resonance structures stabilize the molecules through electrons delocalization.

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