The Pidgeon process is used to refine this element, ions of which are used as the divalent cation in PCR. Calcium and this element are the two metals 
The Pidgeon process is used to refine this element, ions of which are used as the divalent cation in PCR. Calcium and this element are the two metals present in dolomite, and it is the central metal in the chlorophyll molecule. This metal reacts with organic halides to form Grignard reagents. This element is created by the alpha process in stars from fusing Neon and Helium, and one of its first uses was in Epsom salts. This metal burns white in the flame test, and burns hot enough that it is used to light fireworks. For 10 points, name this alkaline earth metal with atomic number twelve and chemical symbol Mg.
The Pidgeon process is used to refine this element, ions of which are used as the divalent cation in PCR.