Oxidation States: The Rules (AQA A-Level Chemistry): Flashcards

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Oxidation States: The Rules
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Oxidation state definition

Hypothetical charge if all bonds were completely ionic

Oxidation state of uncombined elements

0

Oxidation state of monatomic ion

Equal to the charge on the ion

Sum of oxidation states in neutral compound

0

Sum of oxidation states in polyatomic ion

Equal to overall charge of the ion

Typical oxidation state of oxygen

−2-2

Oxidation state of oxygen in peroxides (e.g., H2O2H_2O_2)

−1-1

Usual oxidation state of hydrogen

+1+1

Oxidation state of hydrogen in metal hydrides (e.g., NaHNaH)

−1-1

Oxidation state of Group 1 elements in compounds

+1+1

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