Chemistry: Common Polyatomic Ions

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Last updated 2:31 PM on 7/22/26
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27 Terms

1
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ammonium

NH4 +

2
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nitrite

NO2 -

3
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nitrate

NO3 -

4
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hydroxide

OH -

5
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cyanide

CN -

6
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permanganate

MnO4 -

7
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hydrogen carbonate (bicarbonate)

HCO3 -

8
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hypochlorite

ClO -

9
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chlorite

ClO2 -

10
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chlorate

ClO3 -

11
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perchlorate

ClO4 -

12
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bromate

BrO3 -

13
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iodate

IO3 -

14
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periodate

IO4 -

15
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acetate

C2H3O2 -

16
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dihydrogen phosphate

H2PO4 -

17
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carbonate

CO3 2-

18
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sulfite

SO3 2-

19
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sulfate

SO4 2-

20
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thiosulfate

S2O3 2-

21
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peroxide

O2 2-

22
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chromate

CrO4 2-

23
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dichromate

Cr2O7 2-

24
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hydrogen phosphate (biphosphate)

HPO4 2-

25
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phosphate

PO4 3-

26
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arsenate

AsO4 3-

27
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oxalate

C2O4 2-