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Chemistry · L3 · Assigning an Oxidation Number

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The order-of-operations decision flow for assigning an oxidation number to any atom, from free elements down to the sum rules.

by @openstemUpdated Chemistry
Is the atom in a free, uncombined element?Oxidation number = 0Is it a simple, monatomic ion?Oxidation number = the ion's chargeIs it oxygen in the compound?Usually -2, except peroxides which are -1Is it hydrogen in the compound?Usually +1, except metal hydrides which are -1Is the species neutral overall?Solve so all oxidation numbers sum to 0Solve so all oxidation numbers sum to the ion's chargeYesNoYesNoYesNoYesNoYesNo

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