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Oxidation number

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rsixtyone:
hello all, in this formula:
K2Cr2O7

What is the oxidation number of chromium?

I got +6 somehow:

2 + 2Cr - 14 = 0
2Cr - 12 = 0
2Cr = 12
Cr = +6

Is that correct?

mike:
yes

hexavalent chromium featured in the movie Erin Brockovich

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