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30,700+ Oxygen Symbol Stock Photos, Pictures & Royalty-Free Images - iStock | Periodic table, Oxygen mask, O2
![Why is oxygen written as O2? Can anyone please explain to me why it is that in the periodic table oxygen is written as just O, but elsewhere it is written as Why is oxygen written as O2? Can anyone please explain to me why it is that in the periodic table oxygen is written as just O, but elsewhere it is written as](http://www.online-sciences.com/wp-content/uploads/2014/07/Oxygen-Molecule.jpg)