mag·ne·sium /mægˈniziəm, ʒəm/
mag·ne·sium /mægˈnɪzɪəm, ʒəm/ 名詞
Mag·ne·si·um n. 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.
Magnesium sulphate. Chem. Same as Epsom salts.
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]
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.