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Sulfur Dioxide?

Posted: Sun Nov 05, 2017 12:52 am
by StephanieDoan3B
Why are there three resonance structures for SO2 when the one with two double bonds has the lowest formal charge? Why would the other two structures (one double, one single) be allowed to exist when they have higher formal charge?

Re: Sulfur Dioxide?

Posted: Sun Nov 05, 2017 10:49 am
by RaviAmin1H
This is because there are two resonance structures that are possible, but they are not as common and this can be shown through formal charge. They contribute to the resonance structure in small amounts. The third structure with the least formal charge is the best blend of all three and contributes the most to the structure.

Re: Sulfur Dioxide?

Posted: Wed Nov 08, 2017 5:37 pm
by snehabhargava
A sulfur dioxide molecule is always changing so in reality it is a blend of all 3 but it is in the state with the lowest formal charge the majority of the time.

Re: Sulfur Dioxide?

Posted: Fri Nov 10, 2017 10:44 pm
by 204918982
The two resonance structures can exist because the actual structure is a blend of all three, even though most of the time the sulfur dioxide molecule is in the state of the one with the formal charge of zero.