Symbols and Charges for Monoatomic Ions- Fixed Charge
 
Symbol Name Symbol Name Symbol Name
H+ hydrogen ion Ba+2 barium ion I- iodide
Li+ lithium ion Ra+2 radium ion O-2 oxide
Na+ sodium ion Ag+ silver ion S-2 sulfide
K+ potassium ion Zn+2 zinc ion Se-2 selenide
Rb+ rubidium ion Al+3 aluminum ion Te-2 telluride
Cs+ cesium ion N-3 nitride
Be+2 beryllium ion H- hydride P-3 phosphide
Mg+2 magnesium ion F-  fluoride As-3 arsenide
Ca+2 calcium ion Cl- chloride C-4 carbide
Sr+2 strontium ion Br- bromide 
 
Symbols and Charges for Monoatomic Ions- Variable Charge
 
Symbol Systematic name Common name Symbol Systematic name Common name
 (Stöck system) (Stöck system) 
Cu+ copper(I) cuprous Hg22+ mercury(I) mercurous
Cu2+ copper(II) cupric Hg2+ mercury(II) mercuric
Fe2+ iron(II) ferrous Pb2+ lead(II) plumbous
Fe3+ iron(III) ferric Pb4+ lead(IV) plumbic
Sn2+ tin(II) stannous Co2+ cobalt(II) cobaltous
Sn4+ tin(IV) stannic Co3+ cobalt(III) cobaltic
Cr2+ chromium(II) chromous Au+ gold(I) aurous
Cr3+ chromium(III) chromic Au3+ gold(III) auric
Mn2+ manganese(II) manganous Ni2+ nickel(II) nickelous
Mn3+ manganese(III) manganic Ni3+ nickel(III) nickelic 
 
Symbols and Charges for Polyatomic Ions
 
Formula Name Formula Name
NO3- nitrate CrO4-2 chromate
NO2- nitrite S2O3-2 thiosulfate
CN- cyanide Cr2O72- dichromate
MnO4- permanganate CO3-2 carbonate
OH- hydroxide O2-2 peroxide 
NH2- amide SO4-2 sulfate
C6H5COO- benzoate SO3-2 sulfite
OCN- cyanate  C2O4-2 oxalate
SCN- thiocyanate  SeO4-2 selenate
ClO4- perchlorate B4O7-2 tetraborate
ClO3- chlorate HPO4-2 hydrogen phosphate
ClO2- chlorite SiF6-2  hexafluorosilicate
ClO- hypochlorite SiO3-2 metasilicate
IO4- periodate C4H4O6-2 tartrate 
IO3- iodate TeO4-2 tellurate
IO-  hypoiodite  WO4-2 tungstate 
BrO3- bromate  PO4-3 phosphate
BrO- hypobromite  PO3-3 phosphite 
HSO4- hydrogen sulfate (bisulfate) AsO4-3 arsenate 
HSO3- hydrogen sulfite (bisulfite) BO3-3 borate 
HC2O4- hydrogen oxalate (binoxalate) AlO3-3 aluminate 
HS- hydrogen sulfide C6H5O7-3 citrate
H2PO4-  dihydrogen phosphate  SiO4-4 orthosilicate
C2H3O2-  acetate (CH3COO-)  P2O7-4 pyrophosphate
HCO3- hydrogen carbonate (bicarbonate) 
N3- azide
 
NH4+  ammonium ion H3O+ hydronium