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magnesium a highly reactive chemical element of the alkaline-earth group that has twelve protons in each nucleus and that occurs naturally only in compounds, but that can be isolated as a divalent ion essential in plant and animal nutrition, or as alight, ductile, silver-white solid that bursts into a bright flame when heated above room temperature, used for flares, fireworks, and the like. (symbol: Mg)
milligram a unit of weight equal to one thousandth of a gram or 0.0154 grain. (abbr.: mg)