• A chemical element that is a colorless, odorless, and tasteless diatomic gas whose atomic number is 8. It comprises about 21% of the atmosphere, nearly 50% of the earth's crust, and almost 90% of water, making it the most abundant element on the planet. It is very reactive, forming compounds with almost every element, and has over one dozen known isotopes, of which 3 are stable. Its applications include its use in most combustion reactions, such as those occurring during the utilization of most fuels. Its chemical symbol is O.
  • chemical symbol O

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