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Most of the mass of living organisms is oxygen as a component of water, the major constituent of lifeforms. As compounds including oxides, the element makes up almost half of the Earth's crust.ĭioxygen is used in cellular respiration and many major classes of organic molecules in living organisms contain oxygen, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone. Diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula OĢ. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is a chemical element with symbol O and atomic number 8. For other uses, see Oxygen (disambiguation) and O2 (disambiguation).Ī transparent beaker containing a light blue fluid with gas bubbles For other forms of this element, see Allotropes of oxygen. This article is about the chemical element and its most stable form, OĢ. If you disagree with this page's deletion, please explain why at Candidates for deletion or the page's talk page, or improve this page and remove the tag.Īdmins: Remember to check what links here and the page history before deleting.