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On the face of it without knowing the structure it would be -2 however that would imply an oxidation number for Cs of +6. Fortunately this compound does not exist which explains the weird oxidation number for Cs. There is a compound Cs11O3 and we get a fractional oxidation number of 6/11- Cs11O3 must contain some Cs-Cs bonding.

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10y ago
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10y ago

C- "+4" and S- "-2"

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Q: What is the oxidation number of O in CsO3?
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