Question

what is the formula for copper(il) oxide? co₂ cuo cu₂o cuco₄

Explanation:

Copper(II) oxide is an ionic compound. Copper has a +2 charge (as indicated by the Roman numeral II). Oxygen in oxides has a -2 charge. To form a neutral compound, the charges must balance. One Cu²⁺ ion and one O²⁻ ion combine. So the formula is CuO. CO₂ is carbon dioxide. Cu₂O is copper(I) oxide (copper has a +1 charge here). CuCO₄ is not a valid formula for copper oxide (CO₄ is not a common ion related to oxide formation).

Answer:

CuO