* The formula: Al₂O₃ represents one molecule of aluminum oxide.

* Subscripts: The subscript "3" after the oxygen (O) indicates that there are 3 oxygen atoms in each molecule of Al₂O₃.

* Coefficient: The coefficient "2" in front of Al₂O₃ tells us we have 2 molecules of aluminum oxide.

Calculation:

* Atoms per molecule: 3 oxygen atoms/molecule

* Number of molecules: 2 molecules

* Total oxygen atoms: (3 oxygen atoms/molecule) * (2 molecules) = 6 oxygen atoms

Therefore, there are 6 atoms of oxygen in 2Al₂O₃.