Nearly 20% of the air you breathe is oxygen, and it is also found in water (H2O). Symbolized by the letter O, oxygen is a colorless and odorless gas essential to most living cells. In medical treatments, oxygen in purer concentration can be administered to provide the gas to oxygen-starved cells. Oxygen is abundant in the Earth`s crust, in our atmosphere, and throughout the known universe.

In this model, oxygen atoms are red.

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