Sulfur can form multiple ions, so it depends on the charge:

* Sulfide ion (S²⁻): This is the most common sulfur ion, with a charge of -2.

* Sulfite ion (SO₃²⁻): This ion has a charge of -2 and contains sulfur and oxygen.

* Sulfate ion (SO₄²⁻): This ion also has a charge of -2 and contains sulfur and oxygen.

To be specific, you need to mention the specific ion you're interested in.