oxygen

Plural

oxygens

1. 1.An atom of this element.

   • Look first at any structure to see if there is a carbon with two oxygens attached. Hemiacetals, hemiketals, acetals, and ketals are all alike in that regard.

2. 2.The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.

   • By molar fraction, calcium oxide contains equal parts calcium and oxygen.

3. 3.Molecular oxygen (O₂), a colorless, odorless gas at room temperature.

   • About 21% of the air you breathe is oxygen.

4. 4.A mixture of oxygen and other gases, administered to a patient to help them breathe.

   • Trees give off oxygen and absorb carbon dioxide.

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