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Definition of magnesium:

  1. A light silver- white metallic element, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming ( the oxide) magnesia, with the production of a blinding light ( the so- called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24. 4. Specific gravity, 1. 75.

Synonyms:

atomic number 12, milligram, Mg.

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