AP Chemistry Cations and Anions

Ammonium

Polyatomic cation NH4 +

Hydronium

Polyatomic cation H3O +

Mercury (I) / mercurous

Polyatomic cation Hg2 2+

Aluminum

Monatomic cation Al 3+

Barium

Monatomic cation Ba 2+

Beryllium

Monatomic cation Be 2+

Bismuth

Monatomic cation Bi 3+

Boron

Monatomic cation B 3+

Cadmium

Monatomic cation Cd 2+

Calcium

Ca 2+

Cerium (III)

Monatomic cation Ce 3+

Cerium (IV)

Monatomic cation Ce 4+

Cesium

Monatomic cation Cs +

Chromium (II) / chromous

Monatomic cation Cr 2+

Chromium (III) / chromic

Monatomic cation Cr 3+

Cobalt (II) / cobaltous

Monatomic cation Co 2+

Cobalt (III) / cobaltic

Monatomic cation Co 3+

Copper (I) / cuprous (green)

Monatomic cation Cu +

Copper (II) / cupric (blue)

Monatomic cation Cu 2+

Gallium

Monatomic cation Ga 3+

Gold (I) / aurous

Monatomic cation Au +

Gold (III) / auric

Monatomic cation Au 3+

Hydrogen

Monatomic cation H +

Iron (II) / ferrous (green)

Monatomic cation Fe 2+

Iron (III) / ferric (yellow)

Monatomic cation Fe 3+

Lead (II) / plumbous

Monatomic cation Pb 2+

Lead (IV) / plumbic

Monatomic cation Pb 4+

Lithium

Monatomic cation Li +

Magnesium

Monatomic cation Mg 2+

Manganese (II)

Monatomic cation Mn 2+

Manganese (III)

Monatomic cation Mn 3+

Mercury (II) / mercuric

Monatomic cation Hg 2+

Nickel (II) (green)

Monatomic cation Ni 2+

Potassium

Monatomic cation K +

Rubidium

Monatomic cation Rb +

Silicon

Monatomic cation Si 4+

Silver

Monatomic cation Ag +

Sodium

Monatomic cation Na +

Strontium

Monatomic cation Sr 2+

Thallium

Monatomic cation Tl +

Tin (II) / stannous

Monatomic cation Sn 2+

Tin (IV) / stannic

Monatomic cation Sn 4+

Titanium (III)

Monatomic cation Ti 3+

Titanium (IV)

Monatomic cation Ti 4+

Zinc

Monatomic cation Zn 2+

Acetate

Polyatomic anion C2H3O2 - / CH3COO -

Arsenate

Polyatomic anion AsO4 3-

Borate

Polyatomic anion BO3 3-

Bromate

Polyatomic anion BrO3 -

Carbonate

Polyatomic anion CO3 2-

Chlorate

Polyatomic anion ClO3 -

Chlorite

Polyatomic anion ClO2 -

Chromate (yellow)

Polyatomic anion CrO4 2-

Cyanate

Polyatomic anion OCN -

Cyanide

Polyatomic anion CN -

Dichromate (orange)

Polyatomic anion Cr2O7 2-

Dihydrogen phosphate

Polyatomic anion H2PO4 -

Hexafluorosilicate

Polyatomic anion SiF6 2-

Hydrogen carbonate (bicarbonate)

Polyatomic anion HCO3 -

Hydrogen phosphate

Polyatomic anion HPO4 2-

Hydrogen sulfate (bisulfate)

Polyatomic anion HSO4 -

Hydrogen sulfite

Polyatomic anion HSO3 -

Hydroxide

Polyatomic anion OH -

Hypobromite

Polyatomic anion BrO -

Hypochlorite

Polyatomic anion ClO -

Hypoiodite

Polyatomic anion IO -

Iodate

Polyatomic anion IO3 -

Manganate

Polyatomic anion MnO4 2-

Nitrate

Polyatomic anion NO3 -

Nitrite

Polyatomic anion NO2 -

Oxalate

Polyatomic anion C2O4 2-

Perbromate

Polyatomic anion BrO4 -

Perchlorate

Polyatomic anion ClO4 -

Periodate

Polyatomic anion IO4 -

Permanganate (purple)

Polyatomic anion MnO4 -

Peroxide

Polyatomic anion O2 2-

Phosphite

Polyatomic anion PO3 3-

Phosphate

Polyatomic anion PO4 3-

Selenate

Polyatomic anion SeO4 2-

Silicate

Polyatomic anion SiO3 2-

Sulfate

Polyatomic anion SO4 2-

Sulfite

Polyatomic anion SO3 2-

Tartrate

Polyatomic anion C4H4O6 2-

Tetraborate

Polyatomic anion B4O7 2-

Thiocyanate

Polyatomic anion SCN -

Thiosulfate

Polyatomic anion S2O3 2-

Arsenide

Monatomic anion As 3-

Boride

Monatomic anion B 3-

Bromide

Monatomic anion Br -

Carbide

Monatomic anion C 4-

Chloride

Monatomic anion Cl -

Fluoride

Monatomic anion F -

Hydride

Monatomic anion H -

Iodide

Monatomic anion I -

Nitride

Monatomic anion N 3-

Oxide

Monatomic anion O2 -

Phosphide

Monatomic anion P3 -

Selenide

Monatomic anion Se 2-

Sulfide

Monatomic anion S 2-

Telluride

Monatomic anion Te 2-