Common Polyatomic Ions in Chemistry: Names and Formulas

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Last updated 3:57 AM on 9/24/26
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30 Terms

1
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OH-

hydroxide ion

2
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CN-

cyanide ion

3
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OCH3-

methoxide ion

4
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MnO4-

permanganate ion

5
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OCN-

cyanate ion

6
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NO3-

nitrate ion

7
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CH3CO2-

acetate ion

8
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ClO3-

chlorate ion

9
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CO3-2

carbonate ion

10
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CrO4-2

chromate ion

11
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Cr2O7-2

dichromate ion

12
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C2O4-2

oxalate ion

13
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SO4-2

sulfate ion

14
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PO4-3

phosphate ion

15
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NO2-

nitrite ion

16
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SO3-2

sulfite ion

17
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ClO2-

chlorite ion

18
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HCO3-

hydrogencarbonate ion (bicarbonate ion)

19
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HSO4-

hydrogensulfate ion (bisulfate ion)

20
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HSO3-

hydrogensulfite ion (bisulfite ion)

21
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HC2O4-

hydrogenoxalate ion

22
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HS-

hydrogensulfide ion

23
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H2PO4-

dihydrogenphosphate ion

24
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HPO4-2

monohydrogenphosphate ion

25
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S2O3-2

thiosulfate ion

26
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SCN-

thiocyanate ion

27
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ClO-

hypochlorite ion

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ClO4-

perchlorate ion

29
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H3O+

hydronium ion

30
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NH4+

ammonium ion