Lumen - Introduction to Chemistry - Electronegativity and Oxidation Number

Don't let oxidation-reduction just be a plug-and-chug exercise. It's an accounting system that gives you an easy handle on the relationship between electronegativity difference and bond energy.

Purdue University - Oxidation Numbers

Good treatment of the rules for assigning oxidation numbers.

Oxidation-Reduction and Electrochemistry Resources

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