Honors Chemistry: Common Polyatomic Ions

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Comprehensive vocabulary flashcards covering common polyatomic anions and cations, their formulas, charges, IUPAC names, and historical names.

34 Terms

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Hydroxide

A 1−1^- polyatomic anion with the chemical formula OH1−OH^{1-}.

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Cyanide

A 1−1^- polyatomic anion with the chemical formula CN1−CN^{1-}.

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Cyanate

A 1−1^- polyatomic anion with the chemical formula OCN1−OCN^{1-}.

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Acetate

A 1−1^- polyatomic anion with the chemical formula CH3COO1−CH_3COO^{1-} (IUPAC name: ethanoate).

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Permanganate

A 1−1^- polyatomic anion with the chemical formula MnO41−MnO_4^{1-}.

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Hydrogen carbonate

A 1−1^- polyatomic anion with the chemical formula HCO31−HCO_3^{1-} (old name: bicarbonate).

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Hydrogen sulfate

A 1−1^- polyatomic anion with the chemical formula HSO41−HSO_4^{1-} (old name: bisulfate).

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Hydrogen sulfite

A 1−1^- polyatomic anion with the chemical formula HSO31−HSO_3^{1-} (old name: bisulfite).

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Hydrogen sulfide

A 1−1^- polyatomic anion with the chemical formula HS1−HS^{1-} (old name: bisulfide).

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Dihydrogen phosphate

A 1−1^- polyatomic anion with the chemical formula H2PO41−H_2PO_4^{1-}.

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Nitrite

A 1−1^- polyatomic anion with the chemical formula NO21−NO_2^{1-}.

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Nitrate

A 1−1^- polyatomic anion with the chemical formula NO31−NO_3^{1-}.

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Hypochlorite

A 1−1^- polyatomic anion with the chemical formula ClO1−ClO^{1-} or OCl1−OCl^{1-}.

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Chlorite

A 1−1^- polyatomic anion with the chemical formula ClO21−ClO_2^{1-}.

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Chlorate

A 1−1^- polyatomic anion with the chemical formula ClO31−ClO_3^{1-}.

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Perchlorate

A 1−1^- polyatomic anion with the chemical formula ClO41−ClO_4^{1-}.

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Bromate

A 1−1^- polyatomic anion with the chemical formula BrO31−BrO_3^{1-}.

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Iodate

A 1−1^- polyatomic anion with the chemical formula IO31−IO_3^{1-}.

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Peroxide

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

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Hydrogen phosphate

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

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Carbonate

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

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Oxalate

A 2−2^- polyatomic anion with the chemical formula C2O42−C_2O_4^{2-} (IUPAC name: ethanedioate).

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Chromate

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

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Dichromate

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

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Sulfite

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

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Sulfate

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

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Thiosulfate

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

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Phosphite

A 3−3^- polyatomic anion with the chemical formula PO33−PO_3^{3-}.

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Phosphate

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

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Borate

A 3−3^- polyatomic anion with the chemical formula BO33−BO_3^{3-}.

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Arsenate

A 3−3^- polyatomic anion with the chemical formula AsO43−AsO_4^{3-}.

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Ammonium

A 1+1^+ polyatomic cation with the chemical formula NH41+NH_4^{1+}.

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Hydronium

A 1+1^+ polyatomic cation with the chemical formula H3O1+H_3O^{1+} (not needed until Acid-Base unit).

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Mercury (I)

A 2+2^+ polyatomic cation with the chemical formula Hg22+Hg_2^{2+}.