36 
Report  on  Atomic  Weights. 
Am.  Jour.  Pharm 
January,  1920 
International  Atomic  Weights,  1920. 
Atomic 
Symbol.  Weight. 
Aluminum  Al  27.1 
Antimony  Sb  120.2 
Argon  A  39.9 
Arsenic  As  74  •  96 
Barium  Ba  137. 37 
Bismuth  Bi  208.0 
Boron..  B  10.9 
Bromine.  Br  79. 92 
Cadmium  Cd  1 1 2  . 40 
Caesium  Cs  132.81 
Calcium  Ca  40 . 07 
Carbon  C  12. 005 
Cerium  Ce  140.25 
Chlorine  CI  35.46 
Chromium  Cr  52.0 
Cobalt  Co  58.97 
Columbium  Cb  93 .  i 
Copper  Cu  63.57 
Dysprosium  Dy  162.5 
Erbium  Er  167.7 
Europium  Eu  152.0 
Fluorine  F  19.0 
Gadolinium  Gd  157.3 
Gallium  Ga  70 .  i 
Germanium  Ge  72.5 
Glucinum  Gl  9.1 
Gold  Au  197.2 
Helium                         He  4 . 00 
Holmium  Ho  163.5 
Hydrogen  H  i .  008 
Indium  In  114. 8 
Iodine  I  126.92 
Iridium  Ir  193.  i 
Iron  Fe  55-84 
Krypton  ^...Kr  82.92 
lanthanum  La  1390 
Lead  Pb  207.20 
Lithium  Li  6 . 94 
Lutecium  Lu  1750 
Magnesium  Mg  24.32 
Manganese  Mn  54 . 93 
Mercury  Hg  200 . 6 
Symbol. 
Molybdenum  Mo 
Neodymium  Nd 
Neon  Ne 
Nickel  Ni 
Niton  (radium  emanation)  Nt 
Nitrogen  N 
Osmium  Os 
Oxygen  O 
Palladium  Pd 
Phosphorus  P 
Platinum  Pt 
Potassium  K 
Praseodymium  Pr 
Radium  Ra 
Rhodium  Rh 
Rubidium  Rb 
Ruthenium  Ru 
Samarium  Sa 
Scandium  Sc 
Selenium  Se 
Silicon  Si 
Silver  Ag 
Sodium  Na 
Strontium  Sr 
Sulphur  S 
Tantalum  Ta 
Tellurium  Te 
Terbium  Tb 
Thallium  Tl 
Thorium  Th 
Thulium  Tm 
Tin  Sn 
Titanium  Ti 
Tungsten  W 
Uranium  U 
Vanadium  V 
Xenon  Xe 
Ytterbium  (Neoytterbium)  Yb 
Yttrium  Yt 
Zinc  Zn 
Zirconium  Zr 
Atomic 
Weight. 
96.0 
144 -3 
20. 2 
58.68 
222  .4 
14.008 
190.9 
16.00 
106.7 
31.04 
195-2 
39.10 
140.9 
226.0 
102  .9 
85.45 
loi .  7 
150.4 
44.1 
79.2 
28.3 
107.88 
23  .00 
87-63 
32.06 
181 
127 
159 
204 
232 . 15 
168.5 
118. 7 
48.1 
184.0 
238.2 
51  o 
130.2 
173-5 
89-33' 
65.37 
90.6 
