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barium

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barium


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Barium  \Ba"ri*um\,  n.  [NL.,  fr  Gr  bary`s  heavy.]  (Chem.) 
  One  of  the  elements,  belonging  to  the  alkaline  earth  group  a 
  metal  having  a  silver-white  color,  and  melting  at  a  very  high 
  temperature.  It  is  difficult  to  obtain  the  pure  metal,  from 
  the  facility  with  which  it  becomes  oxidized  in  the  air. 
  Atomic  weight,  137.  Symbol,  Ba  Its  oxide  called  baryta. 
  [Rarely  written  {barytum}.] 
 
  Note:  Some  of  the  compounds  of  this  element  are  remarkable 
  for  their  high  specific  gravity,  as  the  sulphate, 
  called  heavy  spar,  and  the  like  The  oxide  was  called 
  barote  by  Guyton  de  Morveau  which  name  was  changed  by 
  Lavoisier  to  baryta,  whence  the  name  of  the  metal. 
 
  From  WordNet  r  1.6  [wn]: 
 
  barium 
  n  :  a  soft  silvery  metallic  element  of  the  alkali  earth  group 
  found  in  barite  [syn:  {Ba},  {atomic  number  56}] 
 
  From  Elements  database  20001107  [elements]: 
 
  barium 
  Symbol:  Ba 
  Atomic  number:  56 
  Atomic  weight:  137.34 
  Silvery-white  reactive  element,  belonging  to  group  2  of  the  periodic 
  table.  Soluble  barium  compounds  are  extremely  poisonous.  Identified  in 
  1774  by  Karl  Scheele  and  extracted  in  1808  by  Humphry  Davy. 
 
 




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