Symbols and Charges for Polyatomic Ions Formula NO3NO2CrO42Cr2O72CNMnO4OHO22NH2CO32SO42SO32C2O42PO43PO33S2O32AsO43SeO42SiO32C4H4O62-
Name nitrate nitrite chromate dichromate cyanide permanganate hydroxide peroxide amide carbonate sulfate sulfite oxalate phosphate phosphite thiosulfate arsenate selenate silicate tartrate
Formula ClO4ClO3ClO2ClOIO4IO3IOBrO3BrOHCO3HSO4HSO3HC2O4HPO42H2PO4HSBO33B4O72SiF62-
Name perchlorate chlorate chlorite hypochlorite periodate iodate hypoiodite bromate hypobromite hydrogen carbonate (bicarbonate) hydrogen sulfate (bisulfate) hydrogen sulfite (bisulfite) hydrogen oxalate (bioxalate) hydrogen phosphate dihydrogen phosphate hydrogen sulfide borate tetraborate hexafluorosilicate
C2H3O2-
acetate (an alternate way to write acetate is CH3COO-)
There are only two positive polyatomic ions: NH4+ is called the ammonium ion and Hg22+ is called the mercury(I) ion Ion Tests September 23, 2005: Positive Ion Test: All of the monatomic ions and these polyatomic ions: ammonium and mercury(I) September 30, 2005: Negative Ion Test: All of the monatomic ions and these polyatomic ions: nitrate, nitrite, chromate, dichromate, cyanide, permanganate, hydroxide, peroxide, carbonate, sulfate, sulfite, phosphate, acetate, perchlorate, chlorate, chlorite, hypochlorite, hydrogen carbonate (bicarbonate), hydrogen sulfate (bisulfate), hydrogen sulfate (bisulfate), hydrogen sulfite (bisulfite), hydrogen phosphate, dihydrogen phosphate, hydrogen sulfide, borate