Proteins that are named for clusters incorporating this element and iron include Rieske proteins and aconitase. Reaction with a molecule with two atoms of this element, followed by a base, is one common method of umpolung with carbonyls. This element's most common allotrope 
Proteins that are named for clusters incorporating this element and iron include Rieske proteins and aconitase. Reaction with a molecule with two atoms of this element, followed by a base, is one common method of umpolung with carbonyls. This element's most common allotrope is an (*) eight-atom ring. The fuming form of one oxoacid of this element is an equilibrium between its trioxide and its diprotonated tetraoxide. A lead salt of this element is galena, and an iron salt of this element is the mineral pyrite. An atom of this element, found in the amino acid cysteine, replaces oxygen in a thiol. For 10 points, name this element with atomic number sixteen.
Proteins that are named for clusters incorporating this element and iron include Rieske proteins and aconitase.
sulfur