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Oxidation Number Helper
Assign oxidation states by priority rules — free elements, ions, F/O/H conventions — and balance against total charge.
Calculator
Results update as you type. Every step of the working is shown below.
Examples:
Result
Enter values above — the answer appears here instantly, with full working.
Formula used
Σ(states × atoms) = overall charge
Every result substitutes your values into this relation step by step above.
Assumptions
- Simple species where each element appears in ONE environment — alloys/fracttional states rejected clearly.
- O assumed −2 (not peroxide/superoxide); H assumed +1 except metal hydrides.
Limitations
- Species with two unknown elements need one forced manually.