Most Common Cations and Anions

Silver ion

Ag⁺

Aluminum ion

Al³⁺

Barium ion

Ba²⁺

Bromide ion

Br⁻

Cyanide ion

CN⁻

Carbonate ion

CO₃²⁻

Calcium ion

Ca²⁺

Cadmium ion

Cd²⁺

Chlorate ion

ClO₃⁻

Perchlorate ion

ClO₄⁻

Chloride ion

Cl⁻

Cobalt(II) or cobaltous ion

Co²⁺

Chromate ion

CrO₄²⁻

Chromium(III) or chromic ion

Cr³⁺

Dichromate ion

Cr₂O₇²⁻

Cesium ion

Cs⁺

Copper(II) or cupric ion

Cu²⁺

Copper(I) or cuprous ion

Cu⁺

Acetate ion

C₂H₃O₂⁻

Iron(II) or ferrous ion

Fe²⁺

Iron(III) or ferric ion

Fe³⁺

Fluoride ion

F⁻

Mercury(II) or mercuric ion

Hg²⁺

Mercury(I) or mercurous ion

Hg₂²⁺

Hydrogen ion

H⁺

Hydride ion

H⁻

Iodide ion

I⁻

Potassium ion

K⁺

Lithium ion

Li⁺

Magnesium ion

Mg²⁺

Permanganate ion

MnO₄⁻

Manganese(II) or manganous ion

Mn²⁺

Ammonium ion

NH₄⁺

Nitrate ion

NO₃⁻

Sodium ion

Na⁺

Nicklel(II) or nickelous ion

Ni²⁺

Nitride ion

N³⁻

Hydroxide ion

OH⁻

Oxide ion

O²⁻

Peroxide ion

O₂²⁻

Phosphate ion

PO₄³⁻

Lead(II) or plumbous ion

Pb²⁺

Sulfite ion

SO₃²⁻

Sulfate ion

SO₄²⁻

Tin(II) or stannous ion

Sn²⁺

Strontium ion

Sr²⁺

Sulfide ion

S²⁻

Zinc ion

Zn²⁺