| slovo | definícia |
tantalum
(encz) | tantalum,tantal n: [chem.] Nijel |
Tantalum
(gcide) | Tantalum \Tan"ta*lum\, n. [NL. So named on account of the
perplexity and difficulty encounterd by its discoverer
(Ekeberg) in isolating it. See Tantalus.] (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.
[1913 Webster] |
tantalum
(wn) | tantalum
n 1: a hard grey lustrous metallic element that is highly
resistant to corrosion; occurs in niobite and fergusonite
and tantalite [syn: tantalum, Ta, atomic number 73] |
tantalum
(elements) | 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.
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| | podobné slovo | definícia |
tantalum
(encz) | tantalum,tantal n: [chem.] Nijel |
tantalum
(wn) | tantalum
n 1: a hard grey lustrous metallic element that is highly
resistant to corrosion; occurs in niobite and fergusonite
and tantalite [syn: tantalum, Ta, atomic number 73] |
tantalum
(elements) | 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.
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