Ionic Charges

Ions and their Oxidation Numbers

Ions are elements or compounds that are stable through being electrically charged. Here are all the monatomic and polyatomic ions that are widely used.

Oxidation Numbers of Some Monatomic Ions

1+ hydrogen, H⁺ lithium, Li⁺ potassium, K⁺ silver, Ag⁺ sodium, Na⁺	2+ barium, Ba²⁺____magnesium, Mg²⁺ cadmium, Cd²⁺____manganese(II), Mn²⁺ calcium, Ca²⁺____mercury(II), Hg²⁺ cobalt(II), Co²⁺____nickel(II), ²⁺ copper(II), Cu²⁺____strontium, Sr²⁺ iron(II), Fe²⁺____tin(II), Sn²⁺ lead(II), Pb²⁺____zinc, Zn²⁺
3+ aluminum, Al³⁺ chromium(III), Cr³⁺ iron(III), Fe³⁺	4+ lead(IV), Pb⁴⁺	1- bromide, Br^- chloride, Cl^- fluoride, F^- hydride, H^- iodide, I^-	2- oxide, O^2- sulfide, S^2-

Charges of Common Polyatomic Ions

1+ ammonium, NH₄⁺	2+ mercury(I), Hg₂²⁺
1- acetate, CH₃COO^- chlorate, ClO₃^- chlorite, ClO₂^- cyanide, CN^- hydroxide, OH^- hypochlorite, ClO^- iodate, IO₃^- nitrate, NO₃^- nitrite, NO₂^- perchlorate, ClO₄^- permanganate, MnO₄^-	2- carbonate, CO₃^2- chromate, CrO₄^2- dichromate, Cr₂O₇^2- oxalate, C₂O₄^2- peroxide, O₂^2- silicate, SiO₃^2- sulfate, SO₄^2- sulfite, SO₃^2- tartrate, C₄H₄O₆^2- tetraborate, B₄O₇^2- thiosulfate, S₂O₃^2-	3- phosphate, PO₄^3-

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Posted 12-11-2000

Revised 01-10-2001