Grignard reagents contain this metal, and it is found at the center of a porphyrin ring in chlorophyll.
This element is used in a process to create nodules of graphite, which are essential to forming ductile iron alloys. One type of compound containing this element participates in a form of equilibrium named for Schlenk, and this element is used to reduce titanium tetrachloride in a process named for (*) Kroll. The sulfate of this element can be used to treat seizures and eclampsia. Grignard reagents contain this metal, and it is found at the center of a porphyrin ring in chlorophyll. For 10  points, name this element with atomic number 12 and symbol Mg.
This element is used in a process to create nodules of graphite, which are essential to forming ductile iron alloys.
{magnesium} [accept {Mg} before mention]