I am terribly sorry for my absence I was hospitalized
by technicality CO2 still has oxygen in it :P hence the O
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds with most elements...such as Carbon and hydrogen
Truth is, I have barely any idea what's going on. I take physics.