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it varies. since its a transition metal, it can have pretty much any positive charge since its a cation. however the most common charges are 2+ and 4+ No: it should be +1 or +2

Correction added:
  • In Cu2O the ion charge is Cu1+, (cuprous oxide, Cu(I) oxide, oxidation state +1) color brownish red (or yellow, depending on how fine the particles are)
  • In CuO the ion charge is Cu2+, (cuprous oxide, Cu(II) oxide, oxidation state +2) color black
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