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The following list of polyatomic ions should be held to memory. (name, formula, symbol, and charge)
| + 1 Ions | Name | -2 Ions | |
| NH4+1 | ammonium ion | CO3-2 | carbonate |
| CrO4-2 | chromate | ||
| -1 Ions | Cr2O7-2 | dichromate | |
| CN-1 | cyanide | O2-2 | peroxide |
| OH-1 | hydroxide | SO3-2 | sulfite |
| ClO-1 | hypochlorite | SO4-2 | sulfate |
| ClO2-1 | chlorite | C2O4-2 | oxalate |
| ClO3-1 | chlorate | ||
| ClO4-1 | perchlorate | -3 Ions | |
| C2H3O2-1 / CH3COO-1 | acetate | PO4-3 | phosphate |
| MnO4-1 | permanganate | BO3-3 | borate |
| NO2-1 | nitrite | ||
| NO3-1 | nitrate | +2 Ions | |
| HCO3-1 | bicarbonate
or hydrogen carbonate |
Hg2+2 | mercury (I) |
| SCN- | thiocyanate | Hg+2 | mercury (II) |