Common Cations, Anions, and Compounds

ammonium ion

NH₄⁺

hydrogen ion (proton)

H⁺

ion

a particle with an unequal number of protons and electrons, as a result always carrying a positive or negative electric charge having either lost or gained one or more electrons.

anion

a negatively charged ion

cation

a positively charged ion

lithium ion

Li⁺

sodium ion

Na⁺

potassium ion

K⁺

magnesium ion

Mg²⁺

calcium ion

Ca²⁺

strontium ion

Sr²⁺

barium ion

Ba²⁺

aluminum(III) ion

Al³⁺

chromium(II) ion (chromous ion)

Cr²⁺

chromium(III) ion (chromic ion)

Cr³⁺

manganese(II) ion

Mn²⁺

iron(II) ion (ferrous ion)

Fe²⁺

iron(III) ion (ferric ion)

Fe³⁺

cobalt(II) ion (cobaltous ion)

Co²⁺

cobalt(III) ion (cobaltic ion)

Co³⁺

nickel(II) ion

Ni²⁺

nickel(III) ion

Ni³⁺

copper(I) ion (cuprous ion)

Cu⁺

copper(II) ion (cupric ion)

Cu²⁺

silver(I) ion

Ag⁺

gold(I) ion

Au⁺

gold(III) ion

Au³⁺

hydride ion

H^-

hydroxide ion

OH^-

fluoride ion

F^-

chloride ion

Cl^-

hydrochloric acid

HCl

bromide ion

Br^-

hydrobromic acid

HBr

iodide ion

I^-

hydroiodic acid

HI

oxide ion

O^2-

peroxide ion

O₂^2-

hydrogen peroxide

H₂O₂

superoxide ion

O₂^-

sulfide ion

S^2-

nitride ion

N^3-

phosphide ion

P^3-

carbide ion

C^4-

acetate ion

CH₃CO₂^-

acetic acid

CH₃CO₂H

hypochlorite ion

ClO^-

hypochlorous acid

HClO

chlorite ion

ClO₂^-

chlorous acid

HClO₂

chlorate ion

ClO₃^-

chloric acid

HClO₃

perchloric acid

HClO₄

perchlorate ion

ClO₄^-

periodate ion

IO₄^-

periodic acid

HIO₄

bromate ion

BrO₃^-

bromic acid

HBrO₃

sulfite ion

SO₃^2-

sulfate ion

SO₄^2-

sulfuric acid

H₂SO₄

hydrogen sulfate ion (bisulfate ion)

HSO₄^-

thiosulfate ion

S₂O₃^2-