Oxygen is a gas and is above the staircase. Oxygen is in the air that we breathe in and that underwater animals breathe out. Oxygen is in the 16th group and the 2nd period on the periodic table. That means it has 6 valence electrons and two energy levels. Oxygen is also kind of reactive. Oxygen is found in the H2O is the most common compound that has the element oxygen in it. H2O is also commonly known as water.
Slogan: Oxygen, oxygen in our head. If we didn't have it then we'd be dead.