Zinc oxide has the formula ZnO. Each molecule of zinc oxide contains 1 zinc atom and 1 oxygen atom for a total of 2 atoms.
There are 3. NO2 has 1 atom of Nitrogen and 2 of Oxygen.
Calcium Oxide is CaO and thus has 1 atom each of calcium and oxygen and thus a total of two atoms.
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Copper oxide is a compound from the two elements copper and oxygen It contains 2 atoms of copper and 1 atom of oxyen Cu2O