Common Ions Names Chart Page 2
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1
2Names of Common Ions
This is the complete list of polyatomic ions you need to memorize. Again, some of the ions do not follow the rules
mentioned above (i.e. no specific trend); therefore, you need to use your hardcore memory to memorize them.
These are the only polyatomic cations:
+
NH
ammonium (cation)
4
+
H
O
hydronium (cation)
3
2+
Hg
mercury (I)
2
Polyatomic anions with charge –1:
Polyatomic anions with charge –2:
–
–
2
H
PO
dihydrogen phosphate
HPO
hydrogen phosphate
2
4
4
–
–
2
H
PO
dihydrogen phosphite
HPO
hydrogen phosphite
2
3
3
–
–
2
HSO
hydrogen sulfate (bisulfate)
CO
carbonate
4
3
–
–
2
HSO
hydrogen sulfite (bisulfite)
SO
sulfate
3
4
–
–
2
HCO
hydrogen carbonate ( or bicarbonate)
SO
sulfite
3
3
–
–
2
NO
nitrate
S
O
thiosulfate
3
3
2
–
2–
NO
nitrite
CrO
chromate
2
4
–
2–
OH
hydroxide
Cr
O
dichromate
2
7
–
–
2–
C
H
O
acetate (also written as CH
COO
)
O
peroxide
2
3
2
3
2
–
CN
cyanide
–
OCN
cyanate
–
Polyatomic anions with charge –3:
SCN
thiocyanate
–
MnO
permanganate
4
–
–
3
ClO
perchlorate
PO
phosphate
4
4
–
–
3
ClO
chlorate
PO
phosphite
3
3
–
ClO
chlorite
2
–
ClO
hypochlorite
–
BrO
perbromate
4
–
BrO
bromate
3
–
BrO
bromite
2
–
BrO
hypobromite
–
IO
periodate
4
–
IO
iodate
3
–
IO
iodite
2
–
IO
hypoiodite
2
Reyes
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