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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?
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.
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