Definition:Oxygen
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Chemical Element
Oxygen is the chemical element that has $8$ protons in the nuclei of its atoms.
Its chemical symbol is $\text O$.
Isotopes
O-$16$
Oxygen-$16$ is the isotope of oxygen which has $8$ neutrons in addition to its $8$ protons.
O-$16$ is the most common stable isotope of oxygen, making up $99.762 \%$ of the oxygen found on Earth.