Get Affordable VMs - excellent virtual server hosting


browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z

tantalummore about tantalum

tantalum


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  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}] 
 
  From  Elements  database  20001107  [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. 
 
 




more about tantalum