1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

List of Common Polyatomic Ions

Names, Formulas and Charges of Polyatomic Ions

By

This is a list of some of the most common polyatomic ions. It is worth committing the polyatomic ions to memory, including their molecular formulas and ionic charge.

Polyatomic Ion Charge = +1

Ammonium Ion
Todd Helmenstine

ammonium - NH4+

Polyatomic Ion Charge = -1


acetate - C2H3O2-
bicarbonate (or hydrogen carbonate) - HCO3-
bisulfate (or hydrogen sulfate) - HSO4-
chlorate - ClO3-
chlorite - ClO2-
cyanate - OCN-
cyanide - CN-
dihydrogen phosphate - H2PO4-
hydroxide - OH-
nitrate - NO3-
nitrite - NO2-
perchlorate - ClO4-
permanganate - MnO4-
thiocyanate - SCN-

Polyatomic Ion Charge = -2


carbonate - CO32-
chromate - CrO42-
dichromate - Cr2O72-
hydrogen phosphate - HPO42-
peroxide - O22-
sulfate - SO42-
sulfite - SO32-
thiosulfate - S2O32-

Polyatomic Ion Charge = -3


borate - BO33-
phosphate - PO43-
Related Video
What Are Types of Chemical Reactions
How to Make Glowing Water

©2014 About.com. All rights reserved.