Common Polyatomic Ions Chart
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1POLYATOMIC IONS
Table of Names and Composition of Some Common Polyatomic Ions
Corresponding Base or Acid
Cation: Positive Ion
Base
+
NH
ammonium ion
NH
ammonia
4
3
+
H
O
hydronium ion
H
O
water
3
2
Anions: Negative Ions
Acid*
Based on a Group 13 element
3-
BO
borate ion
3
Based on a Group 14 element
–
CN
cyanide ion
HCN
hydrocyanic
–
CH
CO
acetate ion
CH
CO
H
acetic
3
2
3
2
2–
–
CO
carbonate ion
HCO
hydrogen carbonate
3
3
–
HCO
hydrogen carbonate ion (or bicarbonate ion)
H
CO
carbonic (sol’n only)
3
2
3
4-
SiO
silicate ion
4
Based on a Group 15 element
–
NO
nitrite ion
HNO
nitrous (sol’n only)
2
2
–
NO
nitrate ion
HNO
nitric
3
3
3–
2–
PO
phosphate ion
HPO
hydrogen phosphate
4
4
2–
–
HPO
hydrogen phosphate ion
H
PO
dihydrogen phosphate
4
2
4
–
H
PO
dihydrogen phosphate ion
H
PO
phosphoric
2
4
3
4
Based on a Group 16 element
–
OH
hydroxide ion
H
O
water
2
2–
SO
sulfite ion
H
SO
sulfurous (sol’n only)
3
2
3
2–
–
SO
sulfate ion
HSO
hydrogen sulfate
4
4
–
HSO
hydrogen sulfate ion (or bisulfate ion)
H
SO
sulfuric
4
2
4
Based on a Group 17 element
–
ClO
hypochlorite ion
HClO
hypochlorous
–
ClO
chlorite ion
HClO
chlorous
2
2
–
ClO
chlorate ion
HClO
chloric
3
3
–
ClO
perchlorate ion
HClO
perchloric
4
4
–
BrO
bromate ion
3
–
BrO
perbromate ion
4
–
IO
iodate ion
3
–
IO
periodate ion
4
Based on a transition metal
2–
CrO
chromate ion
H
CrO
chromic
4
2
4
2-
Cr
O
dichromate ion
2
7
2–
MoO
molybdate ion
4
–
MnO
permanganate ion
4
–
TcO
pertechnetate ion
4
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