tan·ta·lum /ˈtæntḷəm/
 金屬元素,符號Ta,原子序83


 tan·ta·lum /ˈtæntḷəm/ 名詞
 鉭


 tantalum
 鉭 TA


 tantalum
 鉭


 Tan·ta·lum n.  Chem. A rare nonmetallic element found in certain minerals, as tantalite, samarskite, and fergusonite, and isolated as a dark powder which becomes steel-gray by burnishing. Symbol Ta. Atomic weight 182.0. Formerly called also tantalium.

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 tantalum
      n : a hard gray lustrous metallic element that is highly
          corrosion-resistant; occurs in niobite and fergusonite
          and tantalite [syn: Ta, atomic number 73]


 tantalum
 Symbol: Ta
 Atomic number: 73
 Atomic weight: 180.948
 Heavy blue-grey metallic transition element. Ta-181 is a stable isotope,
 and Ta-180 is a radioactive isotope, with a half-life in excess of 10^7
 years. Used in surgery as it is unreactive. Forms a passive oxide layer in
 air. Identified in 1802 by Ekeberg and isolated in 1820 by Jons J.
 Berzelius.