Common Polyatomic Ion Names & Formulas

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Last updated 8:14 PM on 8/22/26
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26 Terms

1
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Mercury (I)

HG2

2
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Ammonium

NH4+

3
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Nitrite

NO2-

4
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Nitrate

NO3-

5
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Sulfite

SO32-

6
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Sulfate

SO42-

7
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Hydrogen Sulfate

HSO4-

8
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Hydroxide

OH-

9
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Cyanide

CN-

10
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Phosphate

PO43-

11
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Hydrogen Phosphate

HPO42-

12
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Dihydrogen phosphate

H2PO4-

13
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Thiocyanate

NCS- or SCN-

14
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Carbonate

CO32-

15
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Hydrogen carbonate or Bicarbonate

HCO3-

16
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Hypochlorite

ClO- or OCl-

17
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Chlorite

ClO2-

18
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Chlorate

ClO3-

19
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Perchlorate

ClO4-

20
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Acetate

C2H3O2-

21
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Permanganate

MnO4-

22
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Dichromate

Cr2O72-

23
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Chromate

CrO42

24
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Peroxide

O22-

25
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Oxalate

C2O42-

26
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Thiosulfate

S2O32-