Sulfur compounds oxoacids

The ricji oxoacid chemistry of sulfur (pp. 705-21) is not paralleled by the heavier elements of the group. The redox relationships have already been summarized (p. 755). Apart from the dark-brown hydrated monoxide Po(OH)2 , which precipitates when alkali is added to a freshly prepared solution of Po(ll), only compounds in the +4 and +6 oxidation states are known. 

E02 and E03 compounds have structures that are increasingly polymeric for heavier elements. They form oxoacids, of which sulfuric acid is the most important. 

There are many other oxoacids of sulfur, of which the most important are peroxodisulfate j which has a peroxo (O—O) bond, and compounds with S-S bonds including thiosulfate dithionite and tetrathionate. The reaction... 

Sulfur forms the oxoacid H2SO4, no analogous O compound is known. 

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