Am'jJ?y,r*i |>i1Srm" )     R°mance  °f  Chemical  Elements. 
479 
Table  I. 
The  Atomic  "Numbers"  and  the  Periodic  System  of  the  Chemical  Elements. 
(jjs  ^8  S9  60  61  62  63  64  65  66  67  68  69  70  71  72  j  /gs 
^      Ce    Pr    Nd  Sa   Eu  Gd   Tb  Dy  Ho    Er  Tm'  Tm"  Yb  Lu  ^ 
(D 
50 
51 
52 
53 
54 
55 
56 
57 
58 
Sn 
Sb 
Te 
I 
Xe 
Cs 
Ba 
La 
Ce 
32 
33 
34 
35 
36 
37 
39 
40 
Ge 
As 
Se 
Br 
Kr 
Rb 
Sr 
Y 
Zr 
14 
IS 
16 
17 
®  18 
19 
20 
21 
22 
Si 
P 
S 
CI 
^  Ar 
K 
Ca 
Sc 
Ti 
6 
7 
8 
9 
10 
11 
12 
13 
14 
C 
N 
O 
F 
Ne 
Na 
Mg 
Al 
Si 
1 
2 
3 
4 
5 
6 
H 
He 
Li 
Be 
B 
C 
22 
23 
24 
25 
26 
27 
28 
29 
30 
3i 
32 
Ti 
V 
Cr 
Mn 
Fe 
Co 
,Ni 
Cu 
Zn 
Ga 
Ge 
40 
41 
42 
43 
44 
4S 
46 
47 
48 
49 
50 
Zr 
Cb 
Mo 
Ru 
Rh 
Pd 
Ag 
Cd 
In 
Sn 
72 
73 
74 
75 
76 
77 
78 
79 
80 
81 
82 
Lu 
Ta 
W 
Os 
Ir 
Pt 
Au 
Hg 
TI 
Pb 
82 
83 
84 
85 
86 
87 
88 
89 
90 
Pb 
Bi 
Po 
Nt 
Ra 
Ac 
Th 
90 
91 
92 
Th 
Bv 
U 
© 
© 
This  table  shows  the  atomic  number  and  the  symbols  of  the  elements. 
There  are  in  section 
®  the  noble  gases,  electropotential  0,  forming  no  compounds, 
©  the  nonmetals,  strong  electro-negative,  forming  acids, 
©  the  light  metals,  strong  electro-positive,  forming  bases, 
©  the  heavy  metals,  electro-negative  and  -positive, 
©  the  rare  earth  metals,  weak  electro-positive, 
©  the  radio-active  elements,  weak  electropotential. 
The  first  and  last  column  contains  the  elements  of  the  carbon  family, 
which  are  enumerated  twice,  for  they  form  the  connecting  links  or  transitions 
between  the  different  sections.  Many  relationships  exist  between  these  sec- 
tions and  elements,  which  are  embodied  in  the  so-called  periodic  system.  Not 
yet  discovered  elements  are  those  indicated  by  Nos.  43,  61,  75,  85  and  87. 
So  often  in  the  past  experiences  of  mankind  have  theories  been 
created  and  abolished,  that  it  seems  to  many  an  observer  simply  a 
repetition  of  the  old  process.    Yet  it  is  more  than  that. 
I  need  not  go  into  the  details  of  the  history  of  the  conception  of 
