Question

What oxidation number is copper?

Answer 1

Well, copper metal has an oxidation number of ZERO....

Explanation:

[And oxidation number is defined here.](https://socratic.org/questions/5938e05cb72cff2d99ca4bf3)

Typically, copper forms `"cupric ion"`, `Cu^(2+)`, and `"cuprous ion"`, `Cu^(+)`, in its salts and complexes...