Polyatomic Ions to Memorize for IB Chemistry

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Last updated 12:50 PM on 6/14/26
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21 Terms

1
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Cyanide ion

CN -

2
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Ammonium ion

NH4 +

3
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Hydroxide ion

OH -

4
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Sulfite ion

SO3 2-

5
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Sulfate ion

SO4 2-

6
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Nitrite ion

NO2 -

7
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Nitrate ion

NO3 -

8
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Carbonate ion

CO3 2-

9
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Phosphate ion

PO4 3-

10
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Acetate ion

CH3COO -

11
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Bicarbonate / hydrogen carbonate ion

HCO3 -

12
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Bisulfate / hydrogen sulfate ion

HSO4 -

13
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Hypochlorite ion

ClO -

14
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Chlorite ion

ClO2 -

15
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Chlorate ion

ClO3 -

16
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Perchlorate ion

ClO4 -

17
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Permanganate ion

MnO4 -

18
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Dichromate ion

Cr2O7 2-

19
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Peroxide ion

O2 2-

20
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Oxalate / ethanedioate ion

C2O4 2-

21
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Iodate

IO3-