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11 December, 05:40

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

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  1. 11 December, 08:09
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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
  2. 11 December, 08:58
    0
    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.
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