What must take place for copper metal to be oxidized?

someone pls help! I can't seem to find the answer in my book either and its frustrating.

Respuesta :

 The copper would go under oxidation since it will be losing two electrons. Copper starts out with an oxidation number of zero, but in order to balance the compound of CuO with the Oxygen having an oxidation number of -2, a positive 2 is required