Polyatomic ion

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A polyatomic ion is a group of atoms bound together, with a net positive or negative electrical charge. See molecule.

Examples of polyatomic ions are:

Acetate (CH₃COO^-) colorless
Ammonium (NH₄⁺) colorless
Carbonate (CO₃^2-) colorless
Chlorate (ClO₃^-) colorless
Chlorite (ClO₂^2-) colorless
Chromate (CrO₄^2-) yellow
Cyanide (CN^-) colorless
Dichromate (Cr₂O₇^-) red
Hydronium (H₃O⁺) colorless
Hydroxide (OH^-) colorless
Nitrate (NO₃^-) colorless
Nitrite (NO₂^-) colorless
Phosphate (PO₄^3-) colorless
Sulfate (SO₄^2-) colorless
Sulfite (SO₃^2-) colorless

References

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Chemistry