Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula OĢ. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. It is a member of the chalcogen group in 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 it has symbol O and atomic number 8. Type O positive blood is one of the first to run out during a shortage due to its high demand.(O 2) 90.188 K (−182.962 ☌, −297.332 ☏).Those with O positive blood can only receive transfusions from O positive or O negative blood types. Type O positive blood is critical in trauma care. The risk of reaction is much lower in ongoing blood loss situations and O positive is more available than O negative.
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