All chemistry students, both in the Honors and the Applied class need to memorize the following polyatomic ions, exactly as they are written.
Ammonium NH4+ hydronium H3O+
Acetate C2H3O2- hydroxide
OH-
Nitrite NO2- Nitrate
NO3-
Chlorate ClO3- carbonate CO32-
Chromate CrO42- Phosphate
PO43-
Sulfite SO32- Sulfate SO42-
The Honors Chemistry class must also memorize these
additional polyatomic ions.
Cyanide CN- hypochlorite ClO-
Chlorite ClO2- perchlorate ClO4-
Permanganate
MnO4- Chromate CrO42-
Dichromate Cr2O72-