Appendix E: Polyatomic Ions

Common Polyatomic Ions

Table E.1: Common Polyatomic Ions
Name Symbol
Acetate C2H3O2
Amide NH2
Ammonium NH4+
Arsenate AsO43-
Borate BO33-
Bromate BrO3
Carbonate CO32-
Chlorate CIO3
Chlorite CIO2
Chromate CrO42-
Cyanide CN
Dichromate CrO72-
Dihydrogen phosphate H2PO42-
Hydrogen carbonate HCO3
Hydrogen oxalate HC2O4
Hydrogen phosphate HPO42-
Hydrogen sulfate (bisulfate) HSO4
Hydrogen sulfite (bisulfate) HSO3
Hydroxide OH
Hypobromite BrO
Hypochlorite CIO
Hypoiodite IO
Iodate IO3
Nitrate NO3
Nitrite NO2
Oxalate C2O42-
Perchlorate CIO4
Periodate IO4
Permanganate MnO4
Peroxide O22-
Phosphate PO43-
Phosphite PO33-
Sulfate SO42-
Sulfite SO32-
Thiocyanide SCN

Attribution & References

Except where otherwise noted, this page is adapted by Samantha Sullivan Sauer from “Chapter 3: Ions and Ionic Compounds & Molecules and Chemical Nomenclature” In Introductory Chemistry: 1st Canadian Edition by David W. Ball and Jessica A. Key, licensed under CC BY-NC-SA 4.0.


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Enhanced Introductory College Chemistry Copyright © 2023 by Gregory Anderson; Caryn Fahey; Jackie MacDonald; Adrienne Richards; Samantha Sullivan Sauer; J.R. van Haarlem; and David Wegman is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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