When elemental copper loses two electrons it is reduced to Cu2+.
What is oxidation?
Oxidation is the loss of electrons or an increase in the oxidation state of an atom.
What is reduction?
Reduction is the gain of electrons or a decrease in the oxidation state of an atom.
CU²⁺ initial oxidation number = +2
when it losses +2 electron, final oxidation number = 0
Thus, when elemental copper loses two electrons it is reduced to Cu2+.
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