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magnesium vs. magnesium oxide

[ mag-nee-zee-uhm, -zhuhm, -shee-uhm ]
  1. a light, ductile, silver-white, metallic element that burns with a dazzling white light, used in lightweight alloys, flares, fireworks, in the manufacture of flashbulbs, optical mirrors, and precision instruments, and as a zinc substitute in batteries. Symbol: Mg; atomic weight: 24.312; atomic number: 12; specific gravity: 1.74 at 20°C.
  1. magnesia.

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