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Table of Common Polyatomic Ions
Formulas, Charges, and Names
  Related Resources
• Nomenclature of Ionic Compounds
• Group Chemistry
• Element Electron Configuration
• Element Valences
• Charts & Tables
 
 

This is a table of some of the most common polyatomic ions. It's worth committing them to memory, including their charges.

+1 -1 -2 -3
NH4+ (ammonium)  OH- (hydroxide)  CO32- (carbonate)  PO43- (phosphate) 
  NO3- (nitrate)  SO42- (sulfate)   
  ClO3- (chlorate)  CrO42- (chromate)   
  ClO4- (perchlorate)  Cr2O72- (dichromate)   
  MnO4- permanganate)     
  HCO3- 
(hydrogen carbonate) 
   

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