Oxidation and Reduction Defined by Electron Transfer
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Oxidation is the loss of electrons and reduction is the gain of electrons, and the two always occur together in one reaction.
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Zinc metal reacting with copper ions, Zn + Cu²⁺ → Zn²⁺ + Cu, loses electrons from zinc while copper ions gain them.
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"Oxidation" without "reduction" happening somewhere in the same reaction describes an impossible half of a process.