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Oxygen is in this case -2. There are three oxygens in this problem, so the total is -6. Pb's oxidation number is the same as its ionic charge, which is +2. Everything must equal zero out if you add all the numbers together.
+2(Pb)+(Sulfur's oxidation number)-6(Oxygen)= 0
-4+(4)=0
Pb=-2
S=+4
O=-2
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