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boron

more about boron

boron


  4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Boron  \Bo"ron\  (b[=o]"r[o^]n),  n.  [See  {Borax}.]  (Chem.) 
  A  nonmetallic  element  occurring  abundantly  in  borax.  It  is 
  reduced  with  difficulty  to  the  free  state,  when  it  can  be 
  obtained  in  several  different  forms;  viz.,  as  a  substance  of 
  a  deep  olive  color,  in  a  semimetallic  form  and  in  colorless 
  quadratic  crystals  similar  to  the  diamond  in  hardness  and 
  other  properties.  It  occurs  in  nature  also  in  boracite, 
  datolite,  tourmaline,  and  some  other  minerals.  Atomic  weight 
  10.9.  Symbol  B. 
 
  From  WordNet  r  1.6  [wn]: 
 
  boron 
  n  :  a  trivalent  metalloid  element;  occurs  both  in  a  hard  black 
  crystal  and  in  the  form  of  a  yellow  or  brown  powder  [syn: 
  {B},  {atomic  number  5}] 
 
  From  U.S.  Gazetteer  (1990)  [gazetteer]: 
 
  Boron,  CA  (CDP,  FIPS  7568) 
  Location:  35.00492  N,  117.65034  W 
  Population  (1990):  2101  (937  housing  units) 
  Area:  7.6  sq  km  (land),  0.0  sq  km  (water) 
  Zip  code(s):  93516 
 
  From  Elements  database  20001107  [elements]: 
 
  boron 
  Symbol:  B 
  Atomic  number:  5 
  Atomic  weight:  10.811 
  An  element  of  group  13  of  the  periodic  table.  There  are  two  allotropes, 
  amorphous  boron  is  a  brown  power,  but  metallic  boron  is  black.  The 
  metallic  form  is  hard  (9.3  on  Mohs'  scale)  and  a  bad  conductor  in  room 
  temperatures.  It  is  never  found  free  in  nature.  Boron-10  is  used  in 
  nuclear  reactor  control  rods  and  shields.  It  was  discovered  in  1808  by  Sir 
  Humphry  Davy  and  by  J.L.  Gay-Lussac  and  L.J.  Thenard. 
 
 




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