Aluminum Oxidation Number

What is the oxidation number of aluminum in aluminum foil? 3

Aluminum foil is considered pure aluminum metal, so its oxidation number is 0.

It cannot be 0. This is because aluminum reacts to form aluminum oxide in air. This rust covers a layer of aluminum foil.

In fact, the oxidation number of aluminum is 0, but the oxidation number of aluminum oxide from aluminum is +3.

Aluminum Oxidation Number