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infoWhy this? Oxidation states and electron-transfer models allow us to identify oxidation and reduction, distinguish oxidising and reducing agents, and balance redox equations. They provide a common explanation for reactions as varied as combustion, metal displacement, and chemical energy conversion.

scheduleWhy now? Atomic structure, bonding, and periodicity provide the context for formalising oxidation and reduction, including reactions already encountered in organic chemistry. This gives us the reasoning and balancing methods needed for halogen and Group 2 reactions, and later electrochemical cells.