Common Ions and Chemical Formulas

A comprehensive list of common monatomic and polyatomic cations and anions with their names and chemical symbols/formulas.

Aluminum

$$Al^{3+}$$

Ammonium

$$NH_4^+$$

Barium

$$Ba^{2+}$$

Calcium

$$Ca^{2+}$$

Copper (I)

$$Cu^+$$

Copper (II)

$$Cu^{2+}$$

Hydrogen

$$H^+$$

Hydronium

$$H_3O^+$$

Iron (II)

$$Fe^{2+}$$

Iron (III)

$$Fe^{3+}$$

Lead (II)

$$Pb^{2+}$$

Lead (IV)

$$Pb^{4+}$$

Magnesium

$$Mg^{2+}$$

Manganese (II)

$$Mn^{2+}$$

Manganese (III)

$$Mn^{3+}$$

Mercury (I)

$$Hg_2^{2+}$$

Mercury (II)

$$Hg^{2+}$$

Nickel (II)

$$Ni^{2+}$$

Potassium

$$K^+$$

Silver

$$Ag^+$$

Sodium

$$Na^+$$

Strontium

$$Sr^{2+}$$

Tin (II)

$$Sn^{2+}$$

Tin (IV)

$$Sn^{4+}$$

Zinc

$$Zn^{2+}$$

Bromide

$$Br^-$$

Bromite

$$BrO_2^-$$

Bromate

$$BrO_3^-$$

Carbonate

$$CO_3^{2-}$$

Chlorite

$$ClO_2^-$$

Chlorate

$$ClO_3^-$$

Chloride

$$Cl^-$$

Chromate

$$CrO_4^{2-}$$

Cyanide

$$CN^-$$

Dichromate

$$Cr_2O_7^{2-}$$

Fluoride

$$F^-$$

Bicarbonate

$$HCO_3^-$$

Hydrogen Sulfide (Bisulfide)

$$HS^-$$

Hydrogen Sulfite (Bisulfite)

$$HSO_3^-$$

Hydroxide

$$OH^-$$

Iodate (I) (Hypoiodite)

$$IO^-$$

Iodate (III) (Iodite)

$$IO_2^-$$

Iodate (V) (Iodate)

$$IO_3^-$$

Iodate (VII) (Periodate)

$$IO_4^-$$

Iodide

$$I^-$$

Manganate (VII) (Permanganate)

$$MnO_4^-$$

Nitrate

$$NO_3^-$$

Nitride

$$N^{3-}$$

Nitrite

$$NO_2^-$$

Oxide

$$O^{2-}$$

Peroxide

$$O_2^{2-}$$

Phosphate

$$PO_4^{3-}$$

Phosphide

$$P^{3-}$$

Phosphite

$$PO_3^{3-}$$

Sulfate

$$SO_4^{2-}$$

Sulfide

$$S^{2-}$$

Sulfite

$$SO_3^{2-}$$

Thiosulfate

$$S_2O_3^{2-}$$

Thiocyanate

$$SCN^-$$