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magnesium 音标拼音: [mægn'iziəm] n. 镁 镁 magnesium n 1: 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) [synonym: {magnesium}, {Mg}, {atomic number 12}] Magnesium \Mag*ne"si*um\, n. [NL. & F. See {Magnesia}.] (Chem.) A light silver-white metallic element of atomic number 12, 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, 24.305. Specific gravity, 1.75. [1913 Webster] {Magnesium sulphate}. (Chem.) Same as {Epsom salts}. [1913 Webster] 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. das Magnesium[Noun]
magnesio[Noun]
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