This set includes the `19 polyatomic ions listed in the Chemistry Honors Chapter 9 Powerpoint.
NH4+1
ammonium
NO2-1
nitrite
NO3-1
nitrate
SO3-2
sulfite
SO4-2
sulfate
ClO-1
hypochlorite
ClO2-1
chlorite
ClO3-1
chlorate
ClO4-1
perchlorate
MnO4-1
permanganate
OH-1
hydroxide
H3O+1
hydronium
PO4-3
phosphate
CO3-2
carbonate
CN-1
cyanide
CrO4-2
chromate
Cr2O7-2
dichromate
C2H3O2-1
acetate
O2-2
peroxide