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radiummore about radium

radium


  5  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Radium  \Ra`di*um\,  n.  [NL.,  fr  L.  radius  ray.]  (Chem.) 
  An  intensely  radioactive  metallic  element  found  (combined)  in 
  minute  quantities  in  pitchblende,  and  various  other  uranium 
  minerals.  Symbol,  Ra  atomic  weight,  226.4.  Radium  was 
  discovered  by  M.  and  Mme.  Curie,  of  Paris,  who  in  1902 
  separated  compounds  of  it  by  a  tedious  process  from 
  pitchblende.  Its  compounds  color  flames  carmine  and  give  a 
  characteristic  spectrum.  It  resembles  barium  chemically. 
  Radium  preparations  are  remarkable  for  maintaining  themselves 
  at  a  higher  temperature  than  their  surroundings,  and  for 
  their  radiations,  which  are  of  three  kinds:  alpha  rays,  beta 
  rays,  and  gamma  rays  (see  these  terms).  By  reason  of  these 
  rays  they  ionize  gases,  affect  photographic  plates,  cause 
  sores  on  the  skin,  and  produce  many  other  striking  effects. 
  Their  degree  of  activity  depends  on  the  proportion  of  radium 
  present,  but  not  on  its  state  of  chemical  combination  or  on 
  external  conditions.The  radioactivity  of  radium  is  therefore 
  an  atomic  property,  and  is  explained  as  result  from  a 
  disintegration  of  the  atom.  This  breaking  up  occurs  in  at 
  least  seven  stages;  the  successive  main  products  have  been 
  studied  and  are  called 
 
  {radium  emanation}  or  exradio 
 
  {radium  A}, 
 
  {radium  B}, 
 
  {radium  C},  etc  (The  emanation  is  a  heavy  gas,  the  later 
  products  are  solids.)  These  products  are  regarded  as 
  unstable  elements,  each  with  an  atomic  weight  a  little 
  lower  than  its  predecessor.  It  is  possible  that  lead  is 
  the  stable  end  product.  At  the  same  time  the  light  gas 
  helium  is  formed;  it  probably  consists  of  the  expelled 
  alpha  particles.  The  heat  effect  mentioned  above  is 
  ascribed  to  the  impacts  of  these  particles.  Radium,  in 
  turn,  is  believed  to  be  formed  indirectly  by  an 
  immeasurably  slow  disintegration  of  uranium. 
 
  From  WordNet  r  1.6  [wn]: 
 
  radium 
  n  :  an  intensely  radioactive  metallic  element  that  occurs  in 
  minute  amounts  in  uranium  ores  [syn:  {Ra},  {atomic  number 
  88}] 
 
  From  U.S.  Gazetteer  (1990)  [gazetteer]: 
 
  Radium,  KS  (city,  FIPS  58300) 
  Location:  38.17369  N,  98.89386  W 
  Population  (1990):  47  (23  housing  units) 
  Area:  0.1  sq  km  (land),  0.0  sq  km  (water) 
  Zip  code(s):  67550 
  Radium,  MN 
  Zip  code(s):  56762 
 
  From  Elements  database  20001107  [elements]: 
 
  radium 
  Symbol:  Ra 
  Atomic  number:  88 
  Atomic  weight:  (226) 
  Radioactive  metallic  transuranic  element,  belongs  to  group  2  of  the 
  periodic  table.  Most  stable  isotope,  Ra-226  has  a  half-life  of  1602  years, 
  which  decays  into  radon.  Isolated  from  pitchblende  in  1898  Marie  and 
  Pierre  Curie. 
 
 
 
  From  THE  DEVIL'S  DICTIONARY  ((C)1911  Released  April  15  1993)  [devils]: 
 
  RADIUM,  n.  A  mineral  that  gives  off  heat  and  stimulates  the  organ 
  that  a  scientist  is  a  fool  with 
 
 




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