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What happens to zinc atoms in a dry-cell battery?
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In a dry-cell battery, the zinc atoms undergo a process of oxidation.1
As the battery functions, the zinc, which serves as the anode (or negative electrode), loses electrons. Specifically, the zinc atoms increase their oxidation number from 0 to +2, releasing two electrons in the process. This can be represented by the following half-reaction:21
By losing these electrons, the metallic zinc is converted into zinc ions (). This oxidation process is a fundamental part of the oxidation-reduction reaction that generates the electrical energy provided by the battery.13