﻿Rubidium, 
  Sodium 
  and 
  Lithium 
  ivith 
  Thallium. 
  

  

  403 
  

  

  not 
  adapted 
  for 
  measurement. 
  It 
  is 
  permanent 
  in 
  the 
  air 
  and 
  

   recrystallizes 
  unchanged 
  from 
  water. 
  Analyses 
  of 
  separate 
  

   products 
  gave 
  the 
  following 
  results, 
  

  

  

  

  

  

  

  Calculated 
  for 
  

  

  

  A. 
  

  

  B. 
  

  

  C. 
  

  

  D. 
  

  

  Cs 
  3 
  Tl 
  2 
  Br 
  9 
  . 
  

  

  Caesium 
  

  

  

  26-52 
  

  

  26-14 
  

  

  

  26-13 
  

  

  Thallium 
  

  

  27-36 
  

  

  27-21 
  

  

  27-28 
  

  

  

  26-72 
  

  

  Bromine 
  

  

  47-24 
  

  

  47-14 
  

  

  47*08 
  

  

  47-27 
  

  

  47-15 
  

  

  1:1 
  Ccesium 
  and 
  Rubidium 
  Thallic 
  Bromides, 
  CsTlBr 
  i 
  

   and 
  RbTlBi\. 
  H 
  n 
  O. 
  — 
  These 
  two 
  salts 
  are 
  of 
  nearly 
  the 
  same 
  

   color, 
  pale 
  yellow. 
  The 
  rubidium 
  compound 
  which 
  retains 
  its 
  

   luster 
  and 
  color 
  much 
  better 
  than 
  the 
  other, 
  recrystallizes 
  

   unchanged 
  from 
  water, 
  while 
  the 
  caesium 
  salt 
  gives 
  Cs 
  3 
  Tl 
  2 
  Br 
  9 
  , 
  

   when 
  its 
  solution 
  is 
  evaporated 
  to 
  crystallization. 
  The 
  caesium 
  

   salt 
  was 
  observed 
  when 
  2 
  to 
  10 
  g. 
  of 
  caesium 
  bromide 
  were 
  

   added 
  to 
  40 
  g. 
  thallic 
  bromide, 
  and 
  the 
  rubidium 
  salt 
  when 
  3 
  to 
  

   24 
  g. 
  of 
  rubidium 
  bromide 
  were 
  added 
  to 
  40 
  g. 
  thallic 
  bromide. 
  

   Analyses 
  of 
  several 
  different 
  crops 
  gave 
  the 
  following 
  results 
  : 
  

  

  

  A. 
  

  

  B 
  

  

  

  C. 
  

  

  D. 
  

  

  Calculated 
  for 
  

   CsTlBr 
  4 
  . 
  

  

  Caesium 
  

  

  Thallium 
  _._ 
  

   Bromine 
  . 
  . 
  . 
  

  

  19-14 
  

   32-36 
  

   47-76 
  

  

  31* 
  

  

  79 
  

  

  32-04 
  

   48-39 
  

  

  20-44 
  

  

  48-88 
  

  

  20-25 
  

   31-05 
  

  

  48-70 
  

  

  

  A. 
  

  

  

  B. 
  

  

  

  C. 
  

  

  Calculated 
  for 
  

   RbTlBr 
  4 
  . 
  H 
  2 
  

  

  Rubidium 
  

  

  Thallium 
  ... 
  

   Bromine 
  

  

  . 
  13-77 
  

   . 
  32-18 
  

   . 
  50-06 
  

   . 
  3-80 
  

  

  

  13-41 
  

  

  

  13-91 
  

   50-30 
  

  

  13-63 
  

   32-51 
  

   50-99 
  

  

  Water 
  

  

  2-87 
  

  

  The 
  crystallization 
  of 
  these 
  two 
  salts 
  is 
  isometric, 
  the 
  cube 
  

   being 
  the 
  only 
  form 
  observed. 
  

  

  1 
  : 
  1 
  Ccesium 
  and 
  Rubidium 
  Thallic 
  Iodides, 
  CsTU 
  A 
  and 
  

   RbTU 
  A 
  .2Hfi. 
  — 
  Both 
  of 
  these 
  salts 
  were 
  prepared 
  from 
  solu- 
  

   tions 
  containing 
  a 
  large 
  excess 
  of 
  thallic 
  iodide 
  and 
  also 
  from 
  

   solutions 
  containing 
  a 
  large 
  excess 
  of 
  the 
  alkali 
  iodide, 
  so 
  that 
  

   no 
  other 
  type 
  of 
  double 
  iodides 
  with 
  these 
  two 
  metals 
  could 
  be 
  

   obtained. 
  As 
  the 
  thallic 
  iodide 
  was 
  very 
  difficultly 
  soluble 
  in 
  

   water, 
  alcoholic 
  solutions 
  were 
  used 
  where 
  the 
  thallic 
  iodide 
  

   was 
  in 
  excess.' 
  The 
  salts 
  are 
  ruby 
  red, 
  with 
  a 
  brilliant 
  luster, 
  

   which 
  is 
  slowly 
  lost 
  in 
  the 
  air. 
  Both 
  are 
  decomposed 
  by 
  water. 
  

   The 
  analytical 
  results 
  obtained 
  from 
  several 
  different 
  crops 
  are 
  

   given 
  below. 
  

  

  

  

  

  

  Calculated 
  for 
  

  

  

  A. 
  

  

  B. 
  

  

  C. 
  

  

  CsTlI 
  4 
  . 
  

  

  Caesium 
  

  

  .. 
  16-57 
  

  

  16-38 
  

  

  

  15-74 
  

  

  Thallium 
  .. 
  

  

  .. 
  24-09 
  

  

  24-04 
  

  

  

  24-14 
  

  

  Iodine 
  

  

  

  59-48 
  

  

  59-67 
  

  

  60-12 
  

  

  