Question

which of the following is the correct name for cuo?
copper (iii) oxide
copper (ii) oxide
copper (i) oxide
copper oxide

Explanation:

In naming ionic compounds with transition metals (like copper), we need to indicate the oxidation state of the metal. The oxide ion (\(O^{2 -}\)) has a charge of - 2. For the compound \(CuO\), let the oxidation state of \(Cu\) be \(x\). Using the rule that in a neutral compound the sum of the oxidation states of all atoms is zero: \(x+( - 2)=0\), so \(x = + 2\). The Roman numeral in parentheses represents the oxidation state of the metal. So for \(Cu\) with an oxidation state of \(+2\), the name is Copper (II) oxide.

Answer:

Copper (II) oxide