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Why is Copper(II) Oxide "CuO" instead of "Cu2O"
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Why is Copper(II) Oxide "CuO" instead of "Cu2O"

User Stephenfrank
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This is because... Oxygen has a valency of -2. When the elements react, their switch their valencies. The valency of copper goes to oxygen. And oxygen goes to Cu
User Dmitrydwhite
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The (II) is a roman numeral indicating the oxidation number of a transition metal. It is used when you refer to the element/compound by name but does not show up in the formula.
User Louis Charette
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