The Name-inator: Common Ion Table

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Polyatomic Cations

NH₄⁺ ammonium ion
H₃O⁺ hydronium ion

Polyatomic Anions

-1	-2	-3
CH₃COO^- or C₂H₃O₂^- acetate ion CHO₂^- formate ion ClO- hypochlorite ion ClO₂^- chlorite ion ClO₃^- chlorate ion ClO₄^- perchlorate ion CN^- cyanide ion HCO₃^- hydrogen carbonate ion or bicarbonate ion HSO₃^- hydrogen sulfite ion or bisulfite ion HSO₄^- hydrogen sulfate ion or bisulfate ion H₂PO₄^- dihydrogen phosphate ion MnO₄^- permanganate ion NO₂^- nitrite ion NO₃^- nitrate ion OH^- hydroxide ion	CO₃^2- carbonate ion C₂O₄^2- oxalate ion CrO₄^2- chromate ion Cr₂O₇^2- dichromate ion HPO₄^2- hydrogen phosphate ion O₂^2- peroxide ion SiO₃^2- silicate ion SO₃^2- sulfite ion SO₄^2- sulfate ion S₂O₃^2- thiosulfate ion	AsO₄^3- arsenate ion BO₃^3- borate ion PO₃^3- phosphite ion PO₄^3- phosphate ion

Common Metals with More than One Ion

Chromium Cr²⁺, Cr³⁺
Cobalt Co²⁺, Co³⁺
Copper Cu⁺, Cu²⁺
Iron Fe²⁺, Fe³⁺
Lead Pb²⁺, Pb⁴⁺
Manganese Mn²⁺, Mn³⁺, Mn⁴⁺
Mercury Hg₂²⁺ mercury(I) and Hg²⁺ mercury(II)
Tin Sn²⁺, Sn⁴⁺

Careful with this one! Mercury: Hg₂²⁺ (mercury I) and Hg²⁺ (mercury II)

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Polyatomic Cations

Polyatomic Anions

Common Metals with More than One Ion