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What is the atomic mass of oxygen?

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The atomic mass of oxygen is 15.9994 atomic mass units. Oxygen has an atomic number of 8 and is classified as a non-metal. Its symbol is O.

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Oxygen was discovered in 1774 by Joseph Priestly, according to Chemical Elements. Its name comes from the Greek words "oxus," which means acid, and "gennan," which means generate. Oxygen has a melting point of negative 218.4 degrees Celsius and a boiling point of negative 183 degrees Celsius. It has eight protons and eight neutrons, and it has six electrons in its outer shell. It is colorless and has a cubic structure when crystallized.

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