It is the ninth most abundant element by mass in the universe and eighth most abundant in the Earth's crust, where it is present in minerals like olivine and dolomite. In organic chemistry, it is used to prepare the organometallic compounds important in the synthesis of alcohols known as Grignard reagents. In biology, the 2+ ["two plus"] ion of this element serves to activate ATP when bound to it, and as the coordinating 
It is the ninth most abundant element by mass in the universe and eighth most abundant in the Earth's crust, where it is present in minerals like olivine and dolomite. In organic chemistry, it is used to prepare the organometallic compounds important in the synthesis of alcohols known as Grignard reagents. In biology, the 2+ ["two plus"] ion of this element serves to activate ATP when bound to it, and as the coordinating ion in chlorophyll. For ten points, identify this group two element with atomic number twelve and chemical symbol Mg.
It is the ninth most abundant element by mass in the universe and eighth most abundant in the Earth's crust, where it is present in minerals like olivine and dolomite.
{Magnesium}