Skip to content
    Chemistry GCSE

    Oxidation State

    What Oxidation State means in Chemistry GCSE, as defined for OCR.

    Definition of Oxidation State

    A number assigned to an element in chemical combination that represents the number of electrons lost or gained.
    OCR · Topic C4: Predicting and identifying reactions and products (study guide)

    Topics that use Oxidation State

    Related terms

    Using Oxidation State in the exam

    Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.

    Practise Chemistry questions

    Create a free account to answer exam-style questions on this topic and get feedback on your answers.

    Start free

    7 days Premium · Then free forever · No card, no charge

    All Chemistry GCSE terms

    Cookies on MasteryMind

    Essential cookies keep you signed in.

    Analytics and advertising cookies stay off unless you accept. Read our Privacy Policy.