In basic solutions containing this element, the pH indicator azo violet turns deep blue instead of purple. An ion of this element is a cofactor of the enzymes hexokinase and phosphofructokinase (-5[1])(“phospho-fructo-kinase”). Dialkyl (“di-alkyl”) compounds containing this element are precipitated out of solution using dioxane in a reaction discovered by Wilhelm Schlenk. (10[1])Two millimolar of either manganese or this metal are needed for PCR. It’s not zinc, but air-free techniques are used to synthesize highly reactive compounds consisting of this metal (10[1])bonded to an organic group and a halogen. Grignard (“green-YARR”) reagents (10[1])contain (10[2])this metal, (10[1])which also occupies the center of the porphyrin ring of chlorophyll. For 10 points, what element is the second-lightest alkaline earth (10[1])metal and has an atomic number of 12? ■END■ (0[2])