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magnesium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Magnesium \Mag*ne"si*um\, n. [NL. & F. See {Magnesia}.] (Chem.) 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. {Magnesium sulphate}. (Chem.) Same as {Epsom salts}. From WordNet r 1.6 [wn]: magnesium n : a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine) [syn: {Mg}, {atomic number 12}] From Elements database 20001107 [elements]: magnesium Symbol: Mg Atomic number: 12 Atomic weight: 24.312 Silvery metallic element belonging to group 2 of the periodic table (alkaline-earth metals). It is essential for living organisms, and is used in a number of light alloys. Chemically very reactive, it forms a protective oxide coating when exposed to air and burns with an intense white flame. It also reacts with sulphur, nitrogen and the halogens. First isolated by Bussy in 1828.
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