The oxidation state of oxygen is −2 in almost all known compounds of oxygen. The oxidation state −1 is found in a few compounds such as peroxides. Compounds containing oxygen in other oxidation states are very uncommon: −1⁄2 (superoxides), −1⁄3 (ozonides), 0 (elemental, hypofluorous acid), +1⁄2 (dioxygenyl), +1 (dioxygen difluoride), and +2 (oxygen difluoride).
Oxygen forms compounds with almost all of the other known elements, including some of the rarest: technetium (TcO−
4), promethium (Pm2O3), neptunium (NpO2), plutonium (PuO2), americium (AmO2), curium (CmO2), berkelium (BkO2) and californium (Cf2O3); and also with some of the least reactive elements such as xenon (XeO3), gold (Au2O3) and platinum (PtO2). Synthetic elements that have known oxides include einsteinium (Es2O3). The few elements that oxygen will not react with in typical conditions are the noble gases helium, neon, argon and krypton.
Read more about Compounds Of Oxygen: Oxides, Other Inorganic Compounds, Organic Compounds, Biomolecules
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