﻿452 
  Br. 
  H. 
  S. 
  Allen 
  on 
  Molecular 
  

  

  Strontium 
  Compounds 
  (N=38). 
  

  

  Name. 
  Formula. 
  N. 
  ^XlO 
  -12 
  . 
  N^XlO" 
  12 
  . 
  

   Strontium 
  

  

  bromide 
  C 
  SrBr 
  2 
  108 
  1*512 
  8x20*4 
  

  

  chloride 
  SrCl 
  2 
  72 
  2-201 
  7*X2M 
  

  

  fluoride 
  6' 
  SrF 
  2 
  56 
  3-037 
  8 
  X21-3 
  

  

  hydroxide 
  Sr(OH) 
  2 
  56 
  2'204 
  6 
  X20-6 
  

  

  iodide 
  Srl 
  2 
  144 
  1-197 
  8^x20-3 
  

  

  nitrate 
  C 
  Sr(N0 
  3 
  ) 
  2 
  100 
  1-549 
  7|x207 
  

  

  oxide 
  SrO 
  46 
  6'195 
  14 
  X204 
  

  

  silicate 
  SrSiOg 
  76 
  2940 
  11 
  X203 
  

  

  Barium 
  Barium 
  Compounds 
  (N 
  = 
  56). 
  

  

  bromide 
  BaBr 
  2 
  126 
  1'531 
  9 
  x21'3 
  

  

  carbonate 
  (a) 
  BaC0 
  3 
  86 
  2-485 
  10^x20-4 
  

  

  chloride 
  BaCl 
  2 
  90 
  ]-982 
  8|x21'0 
  

  

  fluoride 
  BaF 
  2 
  74 
  2768 
  9 
  x20*5 
  

  

  iodide 
  Bal 
  2 
  162 
  1-153 
  9 
  X207 
  

  

  nitrate 
  C 
  Ba(N0 
  3 
  ) 
  2 
  118 
  1*298 
  7^X20"4 
  

  

  silicate 
  Ba(Si0 
  3 
  ) 
  94 
  2-418 
  11 
  X20'7 
  

  

  (a) 
  " 
  Schmilzt 
  in 
  C0 
  2 
  bei 
  1380° 
  noch 
  nicht" 
  (Boeke). 
  

  

  Comparing 
  together 
  the 
  compounds 
  of 
  calcium, 
  strontium, 
  

   and 
  barium 
  we 
  find 
  that, 
  in 
  general, 
  the 
  frequency 
  number 
  

   corresponding 
  to 
  a 
  particular 
  radicle 
  tends 
  to 
  increase 
  with 
  

   an 
  increase 
  in 
  the 
  atomic 
  number 
  of 
  the 
  metal. 
  Again, 
  

   comparing 
  the 
  chloride, 
  bromide, 
  and 
  iodide 
  for 
  a 
  particular 
  

   metal, 
  it 
  is 
  noticed 
  that 
  the 
  frequency 
  number 
  for 
  the 
  bromide 
  

   is 
  greater 
  than 
  that 
  for 
  the 
  chloride, 
  and 
  the 
  frequency 
  

   number 
  for 
  the 
  iodide 
  is 
  at 
  least 
  as 
  great 
  as 
  that 
  for 
  the 
  

   bromide. 
  In 
  the 
  case 
  of 
  the 
  fluoride, 
  however, 
  the 
  frequency 
  

   number 
  is 
  about 
  the 
  same 
  as 
  that 
  for 
  the 
  iodide. 
  

  

  Zinc 
  Compounds 
  (N 
  = 
  30). 
  

  

  Name. 
  Formula. 
  N. 
  i/XlO~ 
  12 
  . 
  NvXlO 
  -12 
  . 
  

  

  Zinc 
  

  

  acetate 
  Zn(C 
  2 
  H 
  3 
  ) 
  2 
  92 
  M13 
  5 
  X205 
  

  

  bromide 
  C 
  ZnBr 
  2 
  100 
  T408 
  7x201 
  

  

  chloride 
  (a) 
  ZnCl 
  2 
  64 
  1-849 
  5*x2l-5 
  

  

  fluoride 
  C 
  ZnF 
  2 
  48 
  3410 
  8 
  X20'5 
  

  

  iodide 
  C 
  Znl 
  136 
  1-113 
  7|X205 
  

  

  sulphide 
  ZnS 
  46 
  3"936 
  9x20-1 
  

  

  (a) 
  Melting-point 
  of 
  zinc 
  chloride, 
  365° 
  C. 
  "All 
  lower 
  values 
  are 
  

   obtained 
  from 
  impure 
  material." 
  

  

  Cadmium 
  Cadmium 
  Compounds 
  (N 
  = 
  48). 
  

  

  bromide 
  CdBr 
  2 
  118 
  T412 
  8x20"8 
  

  

  chloride 
  CdOl., 
  82 
  1-846 
  7^x20-2 
  

  

  fluoride 
  C 
  OdP 
  2 
  66 
  2-500 
  8" 
  X 
  20*6 
  

  

  iodide 
  Cdl 
  2 
  154 
  1027 
  7§X2M 
  

  

  sulphate 
  CdS0 
  4 
  96 
  2-153 
  10 
  X207 
  

  

  Mercuric 
  Mercury 
  Compounds 
  (N 
  = 
  80). 
  

  

  bromide 
  HgBr., 
  150 
  0927 
  6|x21'4 
  

  

  chloride 
  I-IgCl.; 
  114 
  1-200 
  6|x2M 
  

  

  iodide 
  Hgl 
  2 
  " 
  186 
  0798 
  7~X21'2 
  

  

  Mercurous 
  

  

  iodide(a) 
  Hgl 
  133 
  1-157 
  7±x21-2 
  

  

  (a) 
  Melting-point 
  of 
  mercurous 
  iodide, 
  290° 
  C, 
  Yvon 
  (1873). 
  

  

  