Last updated: March 2, 2026 by Dr. David Park

Understanding Oxidation Numbers and States

Formula

Oxidation numbers represent the hypothetical charge an atom would have if all bonds were completely ionic. They are essential for identifying redox reactions, balancing redox equations, and understanding electron transfer.

Standard rules assign oxygen -2 (except in peroxides), hydrogen +1 (except in metal hydrides), and require the sum of all oxidation numbers to equal the overall charge of the species.

Common use cases:

  • Identifying redox reactions
  • Balancing redox equations
  • Determining electron transfer

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Dr. David Park

Applied Mathematician, PhD Mathematics

David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.

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