* Oxygen as an element: Oxygen (O) is an element, and its atom is its smallest unit. So, one oxygen atom makes up one oxygen atom.
* Oxygen molecule (O2): Oxygen exists naturally as a diatomic molecule, meaning it has two atoms bonded together. There are two oxygen atoms in an O2 molecule.
* Other oxygen-containing molecules: Oxygen is also found in many other molecules, like water (H2O) which has one oxygen atom, carbon dioxide (CO2) which has two, and glucose (C6H12O6) which has six.
So, to answer your question definitively, you need to specify which oxygen molecule you're referring to.
