102 
Table  of  Atomic  Weights. 
Am.  Jour.  Pharm. 
Feb.,  1891. 
of  Atomic  Weights,  of  December  6,  1890,"  or  some  subsequent 
issue. 
This  table  represents  the  latest  and  most  trustworthy  results, 
reduced  to  a  uniform  basis  of  comparison,  with  oxygen  =  16  as 
starting  point  of  the  system.  No  decimal  places  representing  large 
uncertainties  are  used.  When  values  vary,  with  equal  probability 
on  both  sides,  so  far  as  our  present  knowledge  goes,  as  in  the  case 
of  cadmium  (nr8  and  112-2),  the  mean  value  is  given  in  the  table. 
The  names  of  elements  occurring  in  pharmaceutical,  medicinal,  chemicals,  are  printed  in 
talics  : 
Name. 
Symbol. 
Atomic 
weight. 
Name. 
Symbol. 
Atomic 
weight. 
Al 
27' 
Molybdenum^  .  . 
Mo 
06- 
/A  fjf  ifffl  n  77  v 
X  J.  i  *■  is  I*  t  rP\J 1 j          •       •  • 
Sb 
1 20' 
Nickel  ..... 
Ni 
0°  / 
xJLr-DOfl'lL-)          •      •      •  • 
As 
Yd 
A/7  i }  vn  or  pm 
A.  V  tfl/r  t/>^  oft',         •      .  ♦ 
N 
u3 
B  avium            .  . 
Ba 
117' 
Osmium,  .      .  . 
Os 
IQI -7 
Bistituth       •  • 
Bi 
208  '9 
Oxygen  ^ , 
T^nllflrlintn 
x.  ciiia.i_iinj.JLij  ... 
O 
l6 ' 
Bovoii 
ii' 
Pd 
106 '6 
r\VD  1  1  1 1 17 1> 
Jlj  F  %J  / ru  L  /  L-o  ,       »      •      •  • 
Br 
79' 95 
p 
3J 
V_  dvl 1111  Ll  111  j     •     •      •  • 
112" 
~P1  a1"itiiim 
JL  icttlll  LLIIl,        .     .  . 
Pt 
A95 
Caesium     •  •  •  • 
Cs 
1 12  'Q 
Polassium    .  .  . 
K 
70'  II 
V-    Lb  &  LS  I*  IP                     y                         •                  •                 •  • 
Ca 
T?  VinrHnm 
Rh 
C 
12' 
Rubidium,   .  .  . 
Rb 
85-5 
Ce 
I  £0' 2 
Ruthenium,     .  . 
Ru 
ioi*6 
Chlorine,  .... 
CI 
35' 45 
Samarium,  .  .  . 
Sm 
150- 
Chromium,    .  .  . 
Cr 
52-1 
Scandium,    .  .  . 
Sc 
44' 
Cobalt,  .... 
Co 
59' 
Selenium,    .  .  . 
Se 
79' 
Columbium1,    .  . 
Cb 
94' 
Silicon,  .... 
Si 
28-4 
Cu 
63 '4 
Silver,  
Ag 
107-92 
Didymium2,      .  . 
Di 
142-3 
Sodium,  .... 
Na 
23-05 
Er  * 
166-3 
Strontium,   .  .  . 
Sr 
87-6 
Fluorine,  .... 
F 
19' 
Sulphur,  .... 
Tantalum,    .  .  . 
J2'o6 
Gallium,     ..  .  .  . 
Ga 
69- 
Ta 
182-6 
Germanium,  .  .  . 
Ge 
72-3 
9* 
Tellurium,   .  .  . 
Te 
125- 
Giucinum3,   .  .  . 
Gl 
Terbium,  .... 
Tb 
159-5 
Gold,  
Au 
W3 
Thallium,     .  .  . 
Thorium,  .... 
Tl 
204-18 
Hydrogen,     .  .  . 
H 
i' 007 
Th 
232-6 
In 
II37 
Tin,  
Sn 
119- 
I 
126S5 
Titanium,     .  .  . 
Ti 
48- 
Ir 
193-1 
Tungsten,    .  .  . 
W 
184* 
Fe 
56- 
Uranium,  .... 
U 
239-6 
Lanthanum,  .  .  . 
La 
138-2 
Vanadium,  . 
V 
5i'4 
Lead,  
Pb 
206  '95 
Yterbium,    .  .  . 
Yb 
173* 
Lithium,  .... 
Li 
7' 02 
Yttrium,  .... 
Yt 
89-1 
Magnesium,  .  .  . 
Mg 
H'3 
Zint,  
Zn 
65'3 
Manganese,  .  .  . 
Mn 
55' 
Zirconium,  .  .  . 
Zr 
90  6 
Mercury,  .... 
Hg 
200' 
1  Has  priority  over  Niobium. 
2  Now  split  into  Neo-  and  Praseo-Didymium, 
3  Has  priority  over  Beryllium. 
4  Standard,  or  basis  of  the  system. 
