This metal's chloride is often added to PCR mixes to increase the stability of single stranded DNA.
A deficiency of this element may cause eclampsia, and kieserite is a hydrated form of a sulfate of this element. The equilibrium of a class of compounds containing this metal is named for Schlenk. Ions of this metal block NMDA receptors, and a class of compounds in which this element is bonded to a halogen are used to form (*) carbon-carbon bonds. This metal's chloride is often added to PCR mixes to increase the stability of single stranded DNA. This element is bonded to bromine in Grignard reagents, and is found in the center of the chlorin ring of chlorophyll. The sulfate of this element is Epsom salt. For 10 points, name this element with atomic number 12 and symbol Mg.
A deficiency of this element may cause eclampsia, and kieserite is a hydrated form of a sulfate of this element.
magnesium [accept Mg before mentioned]