What is the oxidation number of Al in Al2o3?

In aluminum oxide (Al₂O₃), the oxidation number of aluminum (Al) is +3. This is determined by considering that oxygen typically has an oxidation number of -2. Since there are three oxygen atoms contributing a total of -6, the two aluminum atoms must have a combined oxidation number of +6, leading to an individual oxidation state of +3 for each aluminum atom.