Browse for shows by network:

Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and a potent oxidizing agent. Dioxygen gas currently constitutes approximately 20.95% molar fraction of the Earth's atmosphere. Most of the mass of living organisms is oxygen as a component of water, the major constituent of lifeforms.