Common ions +1, +2, -1 and -2

Sodium ion
Na +1
Cesium ion
Cs +1
Hydrogen ion
H +1
Rubidium ion
Rb +1
Lithium ion
Li +1
Silver ion
Ag +1
Copper (I) ion
Cu +1 ;Roman numeral indicates the charge of this multiple oxidation number ion
Potassium ion
K +1
Ammonium ion
NH4 +1 ;Only positive polyatomic ion
Mercury (I) ion
Hg +1
Chloride
Cl -1
Fluoride
F -1
Bromide
Br -1
Iodide
I -1
Hydride
H -1
Permanganate
MnO4 -1
Perchlorate
ClO4 -1
Chlorate
ClO3 -1
Chlorite
ClO2 -1
Hypochlorite
ClO -1
Bromate
BrO3 -1
Iodate
IO3 -1
Cyanide
CN -1
Hydroxide
OH -1
Acetate
C2H3O2 -1
Nitrate
NO3 -1
Nitrite
NO2 -1
Bicarbonate or Hydrogen Carbonate
HCO3 -1
Bisulfate or Hydrogen Sulfate
HSO4 -1
Bisulfite or Hydrogen Sulfite
HSO3 -1
Sr +2
Strontium ion

O2 -2

Peroxide
Co +2
Cobalt (II) ion
SeO4 -2
Selenate
Cu +2
Copper (II) ion

C2O4 -2

Oxalate
Fe +2
Iron (II) ion
SiF6 -2
Hexafluorosilicate

Zn +2

Zinc ion

C4H4O6 -2

Tartrate
Ca +2
Calcium ion
CO3 -2
Carbonate

Hg2 +2

Mercury (II) ion
SO4 -2
Sulfate
Pb +2
Lead (II) ion
SO3 -2
Sulfite

Cd +2

Cadmium ion
CrO4 -2
Chromate
Mn +2
Manganese (II) ion
Cr2O7 -2

Dichromate

Ni +2
Nickel (II) ion
S -2
Sulfide
Ba +2
Barium ion
O -2
Oxide
Sn +2

Tin (II) ion

SiO3 -2
Silicate
Se -2
Selenide