appropriate oxidation number to the element in red:

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 PO43- 

K2SO3 
 Al2O3 
 S8 
SO2Cl2 
May 14th, 2015

 PO43- : P = +5

K2SO3 : S= +4

Al2O3 : O= -2

S8 : S= 0

SO2Cl2 : S= +6


May 14th, 2015

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