Common Polyatomic Ions Chart
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1Common Polyatomic Ions
+1 CHARGE
-1 CHARGE
-2 CHARGE
-3 CHARGE
ion
name
ion
name
ion
name
ion
name
+
-
2-
3-
NH
ammonium H
PO
dihydrogen phosphite HPO
hydrogen phosphite PO
phosphite
4
2
3
3
3
+
-
2-
3-
H
O
hydronium H
PO
dihydrogen phosphate HPO
hydrogen phosphate PO
phosphate
3
2
4
4
4
2+
-
2-
3-
Hg
mercury(I) HCO
hydrogen carbonate
CO
carbonate
PO
hypophosphite
2
3
3
2
-
2-
3-
HSO
hydrogen sulfite
SO
sulfite
AsO
arsenite
3
3
3
-
2-
3-
HSO
hydrogen sulfate
SO
sulfate
AsO
arsenate
4
4
4
-
2-
NO
nitrite
S
O
thiosulfate
2
2
3
-
2-
NO
nitrate
SiO
silicate
3
3
-
2-
OH
hydroxide
C
carbide
2
-
2-
CH
COO
acetate
C
O
oxalate
3
2
4
-
2-
CrO
chromite
CrO
chromate
2
4
-
2-
CN
cyanide
Cr
O
dichromate
2
7
-
2-
CNO
cyanate
C
H
O
tartrate
4
4
6
-
2-
CNS
thiocyanate
MoO
molybdate
4
-
2-
O
superoxide
O
peroxide
2
2
-
2-
MnO
permanganate
S
disulfide
4
2
-
ClO
hypochlorite
-
ClO
chlorite
2
-
ClO
chlorate
3
-
ClO
perchlorate
4
-
BrO
hypobromite
-
BrO
bromite
2
-
BrO
bromate
3
-
BrO
perbromate
4
-
IO
hypoiodite
-
IO
iodite
2
-
IO
iodate
3
-
IO
periodate
4
-
AlO
aluminate
2
-
N
azide
3
Reactivity Series of Metals
Cs, Rb, K, Na, Li, Sr, Ca, Mg, Al, C, Zn, Cr, Fe, Cd, Co , Ni, Sn, Pb, H, Bi, Cu, Hg, Ag, Au
Reactivity Series of Halogens
F, Cl, Br, I
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