Polyatomic Ion - Examples of Common Polyatomic Ions

Examples of Common Polyatomic Ions

The following tables give examples of commonly encountered polyatomic ions. Only a few representatives are given, as the number of polyatomic ions encountered in practice is very large.

Anions
Acetate (ethanoate) CH3COO− or C2H3O−
2
Acetylide C2−
2
Benzoate C6H5COO− or C7H5O−
2
Bicarbonate (hydrogen carbonate) HCO−
3
Carbonate CO2−
3
Cyanide CN−
Hydroxide OH−
Nitrate NO−
3
Phosphate PO3−
4
Sulfate SO2−
4
Cations
Ammonium NH+
4
Phosphonium PH+
4
Hydronium H3O+
Fluoronium H2F+
Mercury(I) Hg2+
2
Tropylium C7H+
7
Guanidinium C(NH2)+
3

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