Common Polyatomic Ions

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Vocabulary flashcards covering the names, charges, and formulas of common polyatomic cations and anions from Table 3.1.

Last updated 3:50 AM on 9/29/26
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23 Terms

1
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Ammonium

A polyatomic cation with the chemical formula NH4+NH_4^+

2
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Nitrite

A singly charged polyatomic anion with the chemical formula NO2−NO_2^-

3
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Nitrate

A singly charged polyatomic anion with the chemical formula NO3−NO_3^-

4
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Acetate

A singly charged polyatomic anion with the chemical formula CH3CO2−CH_3CO_2^-

5
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Cyanide

A singly charged polyatomic anion with the chemical formula CN−CN^-

6
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Hypochlorite

A singly charged polyatomic anion with the chemical formula ClO−ClO^-

7
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Chlorite

A singly charged polyatomic anion with the chemical formula ClO2−ClO_2^-

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Chlorate

A singly charged polyatomic anion with the chemical formula ClO3−ClO_3^-

9
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Perchlorate

A singly charged polyatomic anion with the chemical formula ClO4−ClO_4^-

10
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Dihydrogen phosphate

A singly charged polyatomic anion with the chemical formula H2PO4−H_2PO_4^-

11
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Hydrogen carbonate

A singly charged polyatomic anion with the chemical formula HCO3−HCO_3^- (also known as bicarbonate)

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Hydrogen sulfate

A singly charged polyatomic anion with the chemical formula HSO4−HSO_4^- (also known as bisulfate)

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Hydroxide

A singly charged polyatomic anion with the chemical formula OH−OH^-

14
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Permanganate

A singly charged polyatomic anion with the chemical formula MnO4−MnO_4^-

15
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Carbonate

A doubly charged polyatomic anion with the chemical formula CO32−CO_3^{2-}

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Chromate

A doubly charged polyatomic anion with the chemical formula CrO42−CrO_4^{2-}

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Dichromate

A doubly charged polyatomic anion with the chemical formula Cr2O72−Cr_2O_7^{2-}

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Peroxide

A doubly charged polyatomic anion with the chemical formula O22−O_2^{2-}

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Hydrogen phosphate

A doubly charged polyatomic anion with the chemical formula HPO42−HPO_4^{2-}

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Sulfite

A doubly charged polyatomic anion with the chemical formula SO32−SO_3^{2-}

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Sulfate

A doubly charged polyatomic anion with the chemical formula SO42−SO_4^{2-}

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Thiosulfate

A doubly charged polyatomic anion with the chemical formula S2O32−S_2O_3^{2-}

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Phosphate

A triply charged polyatomic anion with the chemical formula PO43−PO_4^{3-}