text: Sulfur has four main oxidation states in nature, which are −2, +2, +4, and +6. The common sulfur species of each oxidation state are listed as follows:
  S: HS; (CH)S; BaS
  S: native, or elemental, sulfur
  S: SCl
  S: SO; sulfite ()
  S:  (HSO, CaSO); SF