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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds (notably oxides) with most elements. Photosynthesis releases oxygen, and respiration consumes oxygen.
(floating cities). There is only one planet where gaseous oxygen is found: Earth! And the only reason that Earth has oxygen is because Earth has plants that do photosynthesis. There is no other natural process that we know of that will put significant amounts of oxygen into a planet's atmosphere.o that is bad news if you'd like to live on another planet in our Solar System. However, it does mean that if we ever find a planet around another star that has oxygen in its atmosphere, we can be fairly confident that there is life of some kind on that planet. This page was last updated on July 18, 2015.