Polyatomic Ions List
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Flashcards for the key polyatomic ions and their chemical formulas.
Last updated 1:35 AM on 1/17/26
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25 Terms
1
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Acetate
CH3COO or C2H3O2
2
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Ammonium
NH4+
3
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Carbonate
CO32-
4
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Chlorate
ClO3-
5
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Chlorite
ClO2-
6
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Chromate
CrO42-
7
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Cyanide
CN-
8
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Dichromate
Cr₂O72-
9
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Dihydrogen phosphate
H2PO4-
10
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Hydrogen carbonate (Bicarbonate)
HCO3-
11
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Hydrogen phosphate
HPO42-
12
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Hydrogen sulfate (Bisulfate)
HSO4-
13
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Hydronium
H3O+
14
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Hydroxide
OH-
15
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Hypochlorite
ClO-
16
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Mercury(I) ion
Hg22+
17
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Nitrate
NO3-
18
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Nitrite
NO2-
19
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Perchlorate
ClO4-
20
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Permanganate
MnO4-
21
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Peroxide
O22-
22
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Phosphate
PO43-
23
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Sulfate
SO42-
24
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Sulfite
SO3²-
25
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Thiocyanate
SCN-
Note 
Flashcards (21)