tung·sten /ˈtəŋstən/ 名詞
1. Chem. A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.
2. Min. Scheelite, or calcium tungstate. [Obs.]
Tungsten ocher, or Tungstic ocher Min., tungstite.
n : a heavy gray-white metallic element; the pure form is used
mainly in electrical applications; it is found in several
ores including wolframite and scheelite [syn: wolfram,
W, atomic number 74]
Atomic number: 74
Atomic weight: 183.85
White or grey metallic transition element, formerly called wolfram.
Forms a protective oxide in air and can be oxidized at high temperature.
First isolated by Jose and Fausto de Elhuyer in 1783.