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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: rsixtyone on October 06, 2005, 10:36:57 PM

Title: Oxidation number
Post by: rsixtyone on October 06, 2005, 10:36:57 PM

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?

Title: Re:Oxidation number
Post by: mike on October 06, 2005, 10:40:43 PM

yes

hexavalent chromium featured in the movie Erin Brockovich