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Chemistry Matters

Valences of Common Monatomic and Polyatomic Ions

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Common Monoatomic Cations

Valence Name Ion
1+
Hydrogen H+
Lithium Li+
Sodium Na+
Potassium K+
Cesium Cs+
Silver Ag+
2+ Beryllium Be2+
Magnesium Mg2+
Calcium Ca2+
Cadmium Cd2+
Nickel Ni2+
Strontium Sr2+
Barium Ba2+
3+ Aluminum Al3+


Common Monoatomic Anions

Valence Name Ion
1- Hydride H-
Fluoride F-
Chloride Cl-
Bromide Br-
Iodide I-
2- Oxide O2-
Sulfide S2-
3- Nitride N3-
Phosphide P3-


Common Type II Cations

Name Ion
Iron(III) Fe3+
Iron(II) Fe2+
Copper(II) Cu2+
Copper(I) Cu+
Cobalt(III) Co3+
Cobalt(II) Co2+
Tin(IV) Sn4+
Tin(II) Sn2+
Lead(IV) Pb4+
Lead(II) Pb2+
Mercury(II) Hg2+
Mercury(I) Hg22+


Common Polyatomic Ions

Name Ion
Mercury(I) Hg22+
Ammonium NH4+
Nitrite NO2-
Nitrate NO3-
Sulfite SO32-
Sulfate SO42-
Hydrogen Sulfate
(or bisulfate)
HSO4-
Hydrogen Sulfide HS-
Thiosulfate S2O32-
Hydroxide OH-
Cyanide CN-
Phosphate PO43-
Hydrogen Phosphate HPO42-
Dihydrogen Phosphate H2PO4-
Thiocyanate NCS- or SCN-
Carbonate CO32-
Hydrogen Carbonate
(or Bicarbonate)
HCO3-
Hypochlorite ClO-
Chlorite ClO2-
Chlorate ClO3-
Perchlorate ClO4-
Acetate C2H3O2-
Permanganate MnO4-
Dichromate Cr2O72-
Chromate CrO42-
Peroxide O22-
Oxalate C2O42-
Iodate IO3-
Silicate SiO42-
Bromate BrO3-
Tartate C4H4O62-
Tetraborate B4O72-