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    Chemistry A-Level

    Sum of oxidation numbers equals overall species charge

    What Sum of oxidation numbers equals overall species charge means in Chemistry A-Level, as defined for OCR.

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    Reference: OCR

    The sum of oxidation numbers is zero for a neutral compound and the ion charge for a polyatomic ion, so an unknown value can be calculated by subtracting known contributions.
    OCR · Redox
    The sum of all oxidation numbers equals the overall charge: 0 for a neutral compound, the stated charge for a polyatomic ion.
    OCR · Redox

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