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Find the oxidation number of the element...

Find the oxidation number of the element underlined in the following species,
`PbunderlineSO_4,underlineU_2O_7^(2-),underlineB_4O_7^(2-),underline(Cr)O_4^(2-)`

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S=+6 in `PbSO_4,U=+5` in `U_2O_7^4,B=+3` in `B_4O_7^(2-),Cr=+6` in `CrO_4^(2-)`
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