PURE SCIENCE 
546.5 
.5I 
52 
-55 
56 
2 
Led and silver group 
Led 
Thallium 
Silver group 
Copper 
Silver 
Mercury 
“0 
6 
61 
62 
163 
64 
642 
643 
65 
652 
653 
66 
6% 
68 
69 
691 
692 
694 
695 
696 
697 
Mr 
JI 
72 
73 
41 
75 
76 
77 
18 
MOT 
R 
B81 
82 
83 
841 
842 
.85 
851 
86 
87 
.88 
891 
802 
Cerium group 
Yttrium 
Cerium 
Lanthanum 
Didymium 
Praseodymium 
Neodymium 
Erbium 
Ytterbium 
Terbium 
Aluminum 
[ndium 
Gallium 
Other metals of rare earths 
Scandium 
Samarium or decipium 
Gadolinium 
Germanium 
Europium 
Thulium 
[ron group 
Iron and chromium groups considerd together 
Manganese 
Iron 
Cobalt 
Nickel 
Chromium group 
Chromium 
Molybdenum 
Tungsten or wolfram 
Uranium See also 541.28 
lin group 
Tin and vanadium groups considerd together 
Tin 
Titanium 
Zirconium 
Thorium See also 541.38 
Actinium See also 541.38 
Vanadium group 
Vanadium 
Antimony 
Bismuth 
Tantalum 
Niobium or columbium 
Polonium See also £41.28