Oxygen is a chemical element with symbol O and atomic number 8.

 

Oxygen is the third-most abundant element in the universe, after hydrogen and helium.

 

Oxygen is the most plentiful element in Earth’s crust. The proportion of oxygen by volume in the atmosphere is 21% and by weight in seawater is 89% 

8O

=

Oxygen

ZY-5BA

Pure Air

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