This element was discovered while trying to make the philosopher's stone from urine.
A compound with three aryl groups bonded to this element is a common ligand in organometallic chemistry, and is used in the Wittig reaction. A now discredited 2010 article claimed that GFAJ-1 bacteria could incorporate arsenic in lieu of this element. The violet allotrope of this element was discovered by (*) Johann Willhelm Hittorf, though this element's most common allotropes are its white and red forms. This element was discovered while trying to make the philosopher's stone from urine. For 10 points, name this element located below nitrogen on the periodic table with symbol P.
A compound with three aryl groups bonded to this element is a common ligand in organometallic chemistry, and is used in the Wittig reaction.
phosphorus (prompt on “P”)