Oxidation number 3

Chemistry Level 2

Find the sum of the oxidation numbers of Cr, Fe and B in the following ions and molecule: \[\text{Cr}_{2}\text{O}^{-2}_{7}, \text{Fe(CN)}^{-4}_{6}, \text{B}_{2}\text{H}_{6}.\]

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Oxidation number 3

Excel in math and science

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It's hard to learn from lectures and videos

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Used and loved by 4 million people

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Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.