Magnesium Magnesium is one of the alkaline-earth metals of main group IIa in the periodic table. Magnesium is a grayish-white metal. Normally magnesium is covered with a layer of oxide, MgO, that protects magnesium from air and water. Magnesium is an important element for plant and animal life. Chlorophylls depend greatly on it.Sir Humphrey Davy discovered magnesium in 1775 at England. It was dicovered when he evaporated magnesium amalgam by mixing a moist magnesia and mercuric oxide. The meaning of the name comes from a Greek word ‘'Magnesia.'' Properties of pure magnesium: Atomic number 12 Atomic mass 24.31 Colour Silvery grey metal Density 1.738 g.cm -3 at 20ēC 1.58 g.cm-3 at 650RC (1) Melting point 650ēC Boiling point 1103ēC Crystal structure close-packed hexagonal Heat of combustion ....

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