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Reference.org
Persulfate
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<p>A persulfate (sometimes known as peroxysulfate or peroxodisulfate) is a compound containing the <a href="/facts/Anion/wrbwhF3z">anions</a> SO2−5 or S2O2−8. The anion SO2−5 contains one <a href="/facts/Peroxide/VMU8y4xB">peroxide</a> group per sulfur center, whereas in S2O2−8, the peroxide group bridges the sulfur atoms. In both cases, sulfur adopts the normal tetrahedral geometry typical for the S(VI) oxidation state. These salts are strong oxidizers. </p>