text: Oxides of this element are found in great leaving groups, like triflates and mesylates.
full_question: Oxides of this element are found in great leaving groups, like triflates and mesylates. An oxide of this element easily penetrates through nitrile gloves and leaves unsuspecting chemists with the taste of garlic. Iodine oxidizes this element from its +2 state in a common redox titration. Beta-mercaptoethanol reduces this element, unfolding proteins. Purple bacteria oxidize this element, not carbon. Oxides of (*) nitrogen and this element are subscripted with an X. Oxidation of this element crosslinks keratin fibers. This element's dioxide is oxidized by vanadium into oleum in the contact process. It gets oxidized during vulcanization of rubber. For 10 points, name this nonmetal in the same family as oxygen, which normally exists as a yellow solid or a smelly gas.
first_sentence: Oxides of this element are found in great leaving groups, like triflates and mesylates.
raw_answer: sulfur [or S]