Formulas and Names of Some Common Polyatomic Ions

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Vocabulary flashcards covering the names, chemical formulas, and classifications of common polyatomic cations and anions from Table 2.4.

Last updated 5:06 PM on 9/6/26
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22 Terms

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Ammonium ion

A polyatomic cation with the formula NH4+NH_4^+

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Cyanide ion

A polyatomic anion based on a Group 4A element with the formula CN−CN^-

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Acetate ion

A polyatomic anion based on a Group 4A element with the formula CH3CO2−CH_3CO_2^-

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Carbonate ion

A polyatomic anion based on a Group 4A element with the formula CO32−CO_3^{2-}

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Hydrogen carbonate ion

A polyatomic anion based on a Group 4A element with the formula HCO3−HCO_3^- (also known as bicarbonate ion)

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Oxalate ion

A polyatomic anion based on a Group 4A element with the formula C2O42−C_2O_4^{2-}

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Nitrite ion

A polyatomic anion based on a Group 5A element with the formula NO2−NO_2^-

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Nitrate ion

A polyatomic anion based on a Group 5A element with the formula NO3−NO_3^-

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Phosphate ion

A polyatomic anion based on a Group 5A element with the formula PO43−PO_4^{3-}

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Hydrogen phosphate ion

A polyatomic anion based on a Group 5A element with the formula HPO42−HPO_4^{2-}

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Dihydrogen phosphate ion

A polyatomic anion based on a Group 5A element with the formula H2PO4−H_2PO_4^-

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Hydroxide ion

A polyatomic anion based on a Group 6A element with the formula OH−OH^-

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Sulfite ion

A polyatomic anion based on a Group 6A element with the formula SO32−SO_3^{2-}

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Sulfate ion

A polyatomic anion based on a Group 6A element with the formula SO42−SO_4^{2-}

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Hydrogen sulfate ion

A polyatomic anion based on a Group 6A element with the formula HSO4−HSO_4^- (also known as bisulfate ion)

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Hypochlorite ion

A polyatomic anion based on a Group 7A element with the formula ClO−ClO^-

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Chlorite ion

A polyatomic anion based on a Group 7A element with the formula ClO2−ClO_2^-

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Chlorate ion

A polyatomic anion based on a Group 7A element with the formula ClO3−ClO_3^-

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Perchlorate ion

A polyatomic anion based on a Group 7A element with the formula ClO4−ClO_4^-

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Chromate ion

A polyatomic anion based on a transition metal with the formula CrO42−CrO_4^{2-}

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Dichromate ion

A polyatomic anion based on a transition metal with the formula Cr2O72−Cr_2O_7^{2-}

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Permanganate ion

A polyatomic anion based on a transition metal with the formula MnO4−MnO_4^-