Polyatomic Ions Chart
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1FORMULA
NAME
3-
PO
phosphate
4
3-
PO
phosphite
3
2-
HPO
hydrogen phosphate
4
-
H
PO
dihydrogen phosphate
2
4
2-
SO
sulfate
4
2-
SO
sulfite
3
2-
S
O
thiosulfate
2
3
2-
S
O
persulfate
2
8
-
HSO
bisulfate (or hydrogen sulfate)
4
-
HSO
bisulfite (or hydrogen sulfite)
3
2-
CrO
chromate
4
2-
Cr
O
dichromate
2
7
-
MnO
permanganate
4
2+
Hg
mercury(I) or mercurous
2
-
NO
nitrate
3
-
NO
nitrite
2
-
N
azide
3
3-
BO
borate
3
-
ClO
perchlorate
4
-
ClO
chlorate
3
-
ClO
chlorite
2
-
ClO
hypochlorite
-
CN
cyanide
-
CNO
cyanate
-
CNS
thiocyanate
-
OH
hydroxide
2-
O
peroxide
2
2-
CO
carbonate
3
-
HCO
bicarbonate
(hydrogen carbonate)
3
-
-
C
H
O
(CH
COO
)
acetate
2
3
2
3
2-
C
O
oxalate
2
4
+
NH
ammonium
4
+
H
O
hydronium
3
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