# How many resonance structures are there for S2O2 and S2O3?

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anor277 Share
Feb 5, 2017

Do you mean ${\text{SO}}_{4}^{2 -}$, $\text{sulfate ion}$, and ${\text{S"_2"O}}_{3}^{2 -}$, $\text{thiosulfate ions}$?

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Sulfate dianion is a very common counterion. Here we have sulfur in a $V I +$ oxidation state. For $\text{thiosulfate ion}$, ONE of the oxygens has been replaced by a sulfur. And in the replacement, sulfur has assumed PRECISELY the same oxidation state ($- I I$) of the oxygen it replaces (and such a formalism is reasonable, because sulfur and oxygen are in the same group!). The average oxidation of both sulfurs is still $+ I I$, but we can individually assign separate oxidation states to the central and terminal sulfurs.

Both sulfate and thiosulfate ions have resonance structures, typically ""^(-)O-S(=O)_2-O^-, and ""^(-)O-S(=O)_2-S^-. Of course, the negative charges are delocalized around the chalcogen atoms.

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