When an electron is added to copper the charge on it changes from +2 to +1.This means copper has been chemically ________.

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When an electron is added to an atom or ion, it undergoes reduction. Reduction is the gain of electrons, which decreases the oxidation state of the element. In this case, copper's charge changes from +2 to +1, indicating it has gained an electron and has been reduced.

When an Electron Is Added to Copper the Charge on It