Hyposulfite, SO₂²⁻, is a polyatomic ion of sulfur and oxygen. SO₂²⁻ is also a oxoanion, which refers to a negative ion which contains one or more oxygen atoms. Its compounds, the hyposulfites, are unstable and readily decompose.

Hyposulfite is also used to refer to the thiosulfate ion, S₂O₃²⁻.

Oxoanion Sulfides

• SO₅²⁻ persulfate ion
• SO₄²⁻ sulfate ion
• SO₃²⁻ sulfite ion
• SO₂²⁻ hyposulfite ion

Oxoanions

Sulfit | Sulfite | Sulfito | Sulfite | Sulfiet | Сулфит | Sulfit