This document lists common ions found in chemistry. It includes monatomic cations such as hydrogen, lithium, sodium, and silver ions. Polyatomic cations include ammonium and hydronium ions. Monatomic anions include fluoride, chloride, bromide, and iodide ions. Polyatomic anions include carbonate, nitrate, phosphate, and sulfate ions. It also lists metals that can form multiple ions such as chromium, cobalt, copper, iron, lead, manganese, mercury, and tin.

1. List of Common Ions
Monatomic Cations
+
Polyatomic Cations
H
Li+
Na+
K+
Rb+
Cs+
Ag+
hydrogen
lithium
sodium
potassium
rubidium
cesium
silver
NH4+
H3O+
OHCNO22-
hydroxide
cyanide
peroxide
2+
Mg2+
Ca2+
Sr2+
Ba2+
Zn2+
Cd2+
magnesium
calcium
strontium
barium
zinc
cadmium
3+
Al3+
Bi3+
aluminum
bismuth
CO32C2O42NO2NO3PO33PO43SO32SO42S2O32ClOClO2ClO3ClO4CH3COOor C2H3O2AsO43BO33SiO32MnO4CrO42Cr2O72CHO2-
carbonate
oxalate
nitrite
nitrate
phosphite
phosphate
sulfite
sulfate
thiosulfate
hypochlorite
chlorite
chlorate
perchlorate
1+
Monatomic Anions
HFClBrI-
hydride
fluoride
chloride
bromide
iodide
2-
O2S2-
oxide
sulfide
3-
N3P3-
nitride
phosphide
4-
4-
1-
C
(C22-)
carbide
ammonium
hydronium
Polyatomic Anions
HCO3HSO3HSO4HPO42H2PO4-
acetate
arsenate
borate
silicate
permanganate
chromate
dichromate
formate
hydrogen carbonate
or bicarbonate
hydrogen sulfite
or bisulfite
hydrogen sulfate
or bisulfate
hydrogen phosphate
dihydrogen phosphate

2. Metals with more than one ion
Element
Ion
Classical (ous, ic)
Stock system System
Chromium
Cr2+
Cr3+
Co2+
Co3+
Cu+
Cu2+
Fe2+
Fe3+
Pb2+
Pb4+
Mn2+
Mn3+
Mn4+
Hg22+
Hg2+
Sn2+
Sn4+
chromium(II)
chromium(III)
cobalt(II)
cobalt(III)
copper(I)
copper(II)
iron(II)
iron(III)
lead(II)
lead(IV)
manganese(II)
manganese(III)
manganese(IV)
mercury(I)
mercury(II)
tin(II)
tin(IV)
Cobalt
Copper
Iron
Lead
Manganese
Mercury
Tin
chromous
chromic
cobaltous
cobaltic
cuprous
cupric
ferrous
ferric
plumbous
plumbic
manganous
manganic
mercurous
mercuric
stannous
stannic