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23 September, 08:54

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

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Answers (2)
  1. 23 September, 09:18
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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.
  2. 23 September, 09:23
    0
    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
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