Common Polyatomic Ions

acetate
CH3COO 1-
amide
NH2 1-
azide
N3 1-
benzoate
C6H5COO 1-
bromate
BrO3 1-
chlorate
ClO3 1-
chlorite
ClO2 1-
cyanate
OCN 1-
cyanide
CN 1-
dihydrogen phosphate
H2PO4 1-
formate
HCOO 1-

hydrogen carbonate

(bicarbonate)

HCO3 1-

hydrogen sulfate

(bisulfate)

HSO4 1-

hydrogen sulfide

(bisulfide OR hydrosulfide)

HS 1-

hydroxide

(aq=hydroxyl)

OH 1-
hypochlorite
ClO 1-
iodate
IO3 1-
nitrate
NO3 1-
nitrite
NO2 1-
perchlorate
ClO4 1-
permanganate
MnO4 1-

thiocyanate

(thiocyanato)

SCN 1-
triiodide
I3 1-
vanadate
VO3 1-
carbide
C2 2-
carbonate
CO3 2-
chromate
CrO4 2-
dichromate
Cr2O7 2-
imide
NH 2-
manganate
MnO4 2-
metasilicate
SiO3 2-
monohydrogen phosphate
HPO4 2-
oxalate
C2O4 2-
peroxide
O2 2-
peroxydisulfate
S2O8 2-
phthalate
C8H4O4 2-
polysulfide
SX 2-
selenate
SeO4 2-
sulfate
SO4 2-
sulfite
SO3 2-
tartrate
C4H4O6 2-
tellurate
TeO4 2-
tetraborate
B4O7 2-
thiosulfate
S2O3 2-
tungstate
WO4 2-
zincate
ZnO2 2-
aluminate
AlO3 3-
arsenate
AsO4 3-
borate
BO3 3-
citrate
C6H5O7 3-
phosphate
PO4 3-
phosphite
PO3 3-
orthosilicate
SiO4 4-
pyrophosphate
P2O7 4-
tripolyphosphate
P3O10 5-
ammonium
NH4 1+
hydronium
H3O 1+
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