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Polyatomic ions
Ions composed of 2 or more atoms.
NH₄⁺
Ammonium ion.
Hg₂²⁺
Mercury(I) ion.
CN⁻
Cyanide ion.
O₂²⁻
Peroxide ion.
OH⁻
Hydroxide ion.
C₂H₃O₂⁻
Acetate ion.
NO₂⁻
Nitrite ion.
NO₃⁻
Nitrate ion.
MnO₄⁻
Permanganate ion.
ClO⁻
Hypochlorite ion.
ClO₂⁻
Chlorite ion.
ClO₃⁻
Chlorate ion.
ClO₄⁻
Perchlorate ion.
CO₃²⁻
Carbonate ion.
C₂O₄²⁻
Oxalate ion.
CrO₄²⁻
Chromate ion.
Cr₂O₇²⁻
Dichromate ion.
SO₃²⁻
Sulfite ion.
SO₄²⁻
Sulfate ion.
PO₄³⁻
Phosphate ion.
BrO⁻
Hypobromite ion.
BrO₂⁻
Bromite ion.
BrO₃⁻
Bromate ion.
BrO₄⁻
Perbromate ion.