A charged chemical unit. A positive ion is called a cation and a negatively charged ion is called an anion. The following table lists the names given to some of the more common ions.
| ion | formula |
| acetate |
 |
| aluminum |  |
| ammonium |
 |
| barium |  |
| bromate |
 |
| bromide |  |
| calcium |  |
| carbonate |
 |
| chlorate |  |
| chloride |  |
| chlorite |
 |
| chromate |
 |
| chromium (III) |  |
| cobalt (II) |  |
| copper (I) |  |
| copper (II) |  |
| cyanate |  |
| cyanide |  |
| dichromate |
 |
| fluoride |  |
| hexacyanoferrate (II) |
 |
| hexacyanoferrate (III) |
 |
| hydride |  |
| hydrogen carbonate |  |
| hydrogen sulfate |  |
| hydronium |
 |
| hydroxide |  |
| hypochlorite |  |
| iodide |  |
| iron (II) |  |
| iron (III) |  |
| lead (II) |  |
| magnesium |  |
| mercury (I) |
 |
| mercury (II) |  |
| nickel (II) |  |
| nitrate |
 |
| nitrite |
 |
| oxalate |
 |
| oxide |  |
| perchlorate |
 |
| permanganate |
 |
| peroxide |
 |
| phosphate |
 |
| phosphide |  |
| phosphite |
 |
| potassium |  |
| silver |  |
| sodium |  |
| sulfate |
 |
| sulfide |  |
| sulfite |
 |
| thiocyanate |  |
| thiosulfate |
 |
| tin (II) |  |
| tin (IV) |  |
| zinc |  |
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