OXIDATION NUMBERS

Positive Ion Formula Ox#

Aluminum Al +3

Ammonium NH₄ +1

Antimony (III) Sb +3

Antimony (V) Sb +5

Arsenic (III) As +3

Arsenic (V) As +5

Barium Ba +2

Beryllium Be +2

Bismuth (III) Bi +3

Bismuth (V) Bi +5

Boron B +3

Cadmium Cd +2

Calcium Ca +2

Carbon (II) C +2

Carbon (IV) C +4

Cerium (III) Ce +3

Cerium (IV) Ce +4

Cesium Cs +1

Chromium (II) Cr +2

Chromium (III) Cr +3

Chromium (VI) Cr +6

Cobalt (II) Co +2

Cobalt (III) Co +3

Copper (I) Cu +1

Copper (II) Cu +2

Francium Fr +1

Gallium (III) Ga +3

Germanium (II) Ge +2

Germanium (IV) Ge +4

Gold (I) Au +1

Gold (III) Au +3

Hydrogen H +1

Indium (I) In +1

Indium (III) In +3

Iridium (II) Ir +2

Iridium (III) Ir +3

Iridium (IV) Ir +4

Iron (II) Fe +2

Iron (III) Fe +3

Lead (II) Pb +2

Lead (IV) Pb +4

Lithium Li +1

Magnesium Mg +2

Manganese (II) Mn +2

Manganese (III) Mn +3

Manganese (IV) Mn +4

Manganese (VI) Mn +6

Manganese (VII) Mn +7

Mercury (I) Hg₂ +2

Mercury (II) Hg +2

Positive Ion Formula Ox#

Nickel (II) Ni +2

Nickel (III) Ni +3

Nitrogen (III) N +3

Nitrogen (V) N +5

Phosphorus (III) P +3

Phosphorus (V) P +5

Platinum (II) Pt +2

Platinum (IV) Pt +4

Potassium K +1

Radium Ra +2

Rubidium Rb +1

Scandium Sc +3

Selenium (IV) Se +4

Selenium (VI) Se +6

Silicon (IV) Si +4

Silver Ag +1

Sodium Na +1

Strontium Sr +2

Sulfur (IV) S +4

Sulfur (VI) S +6

Tellurium (IV) Te +4

Tellurium (VI) Te +6

Thallium (I) Tl +1

Thallium (III) Tl +3

Thorium (IV) Th +4

Tin (II) Sn +2

Tin (IV) Sn +4

Titanium (II) Ti +2

Titanium (III) Ti +3

Titanium (IV) Ti +4

Tungsten (II) W +2

Tungsten (IV) W +4

Tungsten (V) W +5

Tungsten (VI) W +6

Uranium (III) U +3

Uranium (IV) U +4

Uranium (V) U +5

Uranium (VI) U +6

Vanadium (II) V +2

Vanadium (III) V +3

Vanadium (IV) V +4

Vanadium (V) V +5

Zinc Zn +2

Zirconium (II) Zr +2

Zirconium (III) Zr +3

Zirconium (IV) Zr +4

OXIDATION NUMBERS

Negative Ion Formula Ox#

Acetate CH₃COO

or C₂H₃O₂ -1

Arsenate AsO₄ -3

Arsenite AsO₃ -3

Azide N₃ -1

Benzoate C₇H₅O₂ -1

Borate BO₃ -3

Bromate BrO₃ -1

Bromide Br -1

Carbide C -4

Carbonate CO₃ -2

Chlorate ClO₃ -1

Chloride Cl -1

Chlorite ClO₂ -1

Chromate CrO₄ -2

Citrate C₆H₅O₇ -3

Cyanide CN -1

Dichromate Cr₂O₇ -2

Dihydrogen phosphate H₂PO₄ -1

Dihydrogen phosphite H₂PO₃ -1

Fluoride F -1

Formate CHO₂ -1

Hexachloroplatinate (IV) PtCl₆ -2

Hexacyanoferrate (II) Fe(CN)₆ -4

Hexacyanoferrate (III) Fe(CN)₆ -3

Hexafluorosilicate SiF₆ -2

Hydride H -1

Hydrogen carbonate

or bicarbonate HCO₃ -1

Hydrogen sulfate

or bisulfate HSO₄ -1

Hydrogen sulfide HS -1

Hydrogen sulfite HSO₃ -1

Hydroxide OH -1

Hypochlorite ClO

or OCl -1

Hypophosphite PH₂O₂ -1

Iodate IO₃ -1

Iodide I -1

Iodite IO₂ -1

Meta-bisulfite S₂O₅ -2

Molybdate MoO₄ -2

Monohydrogen phosphate HPO₄ -2

Monohydrogen phosphite HPO₃ -2

Nitrate NO₃ -1

Nitride N -3

Nitrite NO₂ -1

Negative Ion Formula Ox#

Oxalate C₂O₄ -2

Oxide O -2

Perchlorate ClO₄ -1

Periodate IO₄ -1

Permanganate MnO₄ -1

Peroxide O₂ -2

Peroxyborate BO₃ -1

Peroxydisulfate S₂O₈ -2

Phosphate PO₄ -3

Phosphide P -3

Phosphite PO₃ -3

Pyrophosphate P₄O₇ -4

Selenate SeO₄ -2

Selenide Se -2

Silicate SiO₃ -2

Silicide Si -4

Sulfate SO₄ -2

Sulfide S -2

Sulfite SO₃ -2

Tartrate C₄H₄O₆ -2

Tellurate TeO₄ -2

Telluride Te -2

Tetraborate B₄O₇ -2

Thiocyanate SCN

or CNS -1

Thiosulfate S₂O₃ -2

Tungstate WO₄ -2

Vanadate VO₃ -1