polyatomic ions

acetate
CH3COO-1 (C2H3O2-1)
ammonium
NH4+1
carbonate
CO3-2
chromate
CrO4-2
hydroxide
OH-1
nitrate
NO3-1
nitrite
NO2-1
phosphate
PO4-3
sulfate
SO4-2
sulfite
SO3-2
x

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