Polyatomic Ions to Know

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Last updated 6:03 AM on 8/20/26

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30 Terms

1

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Hydroxide

OH^-

2

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Bicarbonate

HCO₃^-

3

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Bisulfate

HSO₄^-

4

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Nitrate

NO₃^-

5

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Nitrite

NO₂^-

6

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Cyanide

CN^-

7

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Cyanate

CNO^-

8

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Thiocyanate

SCN^-

9

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Hypochlorite

ClO^-

10

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Chlorite

ClO₂^-

11

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Chlorate

ClO₃^-

12

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Perchlorate

ClO₄^-

13

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Acetate

C₂H₃O₂^-

14

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Permanganate

MnO₄^-

15

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Dihydrogen phosphate

H₂PO₄^-

16

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Peroxide

O₂^2-

17

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Carbonate

CO₃^2-

18

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Oxalate

C₂O₄^2-

19

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Chromate

CrO₄^2-

20

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Dichromate

Cr₂O₇^2-

21

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Sulfate

SO₄^2-

22

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Sulfite

SO₃^2-

23

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Hydrogen phosphate

HPO₄^2-

24

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Phosphate

PO₄^3-

25

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Phosphite

PO₃^3-

26

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Arsenate

AsO₄^3-

27

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Ammonium

NH₄⁺

28

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Hydronium

H⁺ or H₃O⁺

29

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Hydrogen Ion

H⁺or H₃O⁺

30

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Mercury (1) ion

Hg₂²⁺