# RESOURCE: Common Polyatomic Ions

This post has a lot of math! If some of the formulae look weird or unreadable, give it a second to render. If it’s still got $all over the place after a few seconds, try disabling your adblock and refreshing the page. There’s a printable version of this post here. ## Cations •$\newcommand{ra}{\rightarrow\text{ }}\ce{H3O+}\ra$Hydronium •$\ce{NH4+}\ra$Ammonium •$\ce{PH4+}\ra$Phosphonium ## Anions ### Group 3 •$BO3^{3-}\ra$Borate ### Group 4 #### Inorganic •$\ce{CN-}\ra$Cyanide •$\ce{CO3-}\ra$Carbonate •$\ce{HCO3-}\ra$Bicarbonate •$\ce{SiO3^{2-}}\ra$Silicate/Metasilicate •$\ce{SnO3^{2-}}\ra$Stannate #### Organic •$\ce{C2O4^{2-}}\ra$Oxalate •$\ce{C2H3O2-}\ra$Acetate •$\ce{C3H5O3-}\ra$Lactate/Propionate •$\ce{C6H8O7^{3-}}\ra$Citrate •$\ce{C7H5O2-}\ra$Benzoate •$\ce{C7H5O3-}\ra$Salicylate ### Group 5 •$\ce{N3-}\ra$Azide •$\ce{NO3-}\ra$Nitrate •$\ce{NO2-}\ra$Nitrite •$\ce{PO4^{3-}}\ra$Phosphate •$\ce{HPO4^{2-}}\ra$Hydrogen Phosphate •$\ce{H2PO4-}\ra$Dihydrogen Phosphate •$\ce{AsO4^{3-}}\ra$Arsenate •$\ce{AsO3^{3-}}\ra$Arsenite ### Group 6 •$\ce{O2^{2-}}\ra$Peroxide •$\ce{OH-}\ra$Hydroxide •$\ce{SO4^{2-}}\ra$Sulfate/Sulphate •$\ce{SO3^{2-}}\ra$Sulfite/Sulphite •$\ce{HSO4-}\ra$Bisulphate/Bisulfate •$\ce{HSO3-}\ra$Bisulphite/Bisulfite •$\ce{SCN-}\ra$Thiocyanate •$\ce{S2O3^{2-}}\ra$Thiosulfate/Thiosulphate •$\ce{S2O8^{2-}}\ra$Peroxydisulfate/Peroxydisulphate •$\ce{SeO4^{2-}}\ra$Selenate ### Group 7 •$\ce{FO3-}\ra$Fluorate •$\ce{ClO4-}\ra$Perchlorate •$\ce{ClO3-}\ra$Chlorate •$\ce{ClO2-}\ra$Chlorite •$\ce{ClO-}\ra$Hypochlorite •$\ce{BrO3-}\ra$Bromate •$\ce{BrO2-}\ra$Bromite •$\ce{IO3-}\ra$Iodate •$\ce{IO2-}\ra$Iodite •$\ce{AtO3-}\ra$Astatate ## Transitional Metal Anions •$\ce{CrO4^{2-}}\ra$Chromate •$\ce{Cr2O7^{2-}}\ra$Dichromate •$\ce{MnO4-}\ra$Permaganate •$\ce{MnO4^{2-}}\ra$Maganate •$\ce{WO4^{2-}}\ra$Tungstate •$\ce{MoO4^{2-}}\ra$Molybdate •$\ce{Fe(CN)6^{4-}}\ra$Ferrocyanide •$\ce{VO3-}\ra\$Vanadate
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