482 Hachh — Modification of the Periodic Table. 



cleared up until the recent discovery of the high-fre- 

 quency spectra of the elements by Moseley, 9 and the 

 assignment of atomic numbers to the elements. From 

 the work of Broglie, 10 Hicks, 11 and Rydberg, 12 and others 

 we are now comparatively certain as to the relative 

 atomic numbers of the elements and the spaces left blank 

 by so far undiscovered elements. 



We can, therefore, proceed to establish the periodic 

 system in a more rigid form. The customary table of 

 Mendeleeff and Meyer is not correct, owing to the extreme 

 difficulty of classifying the elements Nos. 59-72. If they 





1A 



2A 



3A I 4 



5A 



6A 



7A 



C 











la 



2. He 



3. Li 



4. Be 



5.B 



6.C 



7.N 



8.0 



9.F 



10. Ne 



-lb 



Ha 



10. Ne 



11. Na 



12. Mg 



13. Al 



14. Si 



15. P 



16. S 



17. CI 



18. A 



lib 



Ilia 



18.A 



19. K 



20. Ca 



21. Sc 



22. Ti 

 32. Ge 



33. As 



34. Se 



35. Br 



36. Kr 



nib 



IVa 



36. Kr 



37. Rb 



38. Sr 



39. Y 



40. Zr 

 50. Sn 



51. Sb 



52. Te 



53.1 



54. Xe 



IVb 



Va 



54.Xe 



55. Cs 



56. Ba 



57. La 



58. Ce 

 72. Lu 

 82. Pb 



83. Bi 



84. Po 



85. 



86. Nt 



Vb 



Via 



86. Nt 



87. 



88. Ra 



89. Ac 



90. Th 











+ ~n. 1 







±0 







too 







T 













Table I. The periods of the system: Group O being the terminals, 

 Group 4 being the transition points. 



are placed in the usual way, we would expect to find 

 another rare gas between Xe and Nt; another alkali 

 metal between Cs and No. 87 ; and so on — but we know 

 that this is not the case, and the considerations of this 

 paper will prove this. 



Many attempts have been made to harmonize these facts 

 with the periodic system, either by means of "pleyads" 

 2 Ce, 2 Fe as proposed by Biltz, 13 Buchner 14 and others, 

 or by subdivision into smaller groups, e. g. by R. J. 

 Meyer; 15 or by simply writing these elements into the 

 different groups, without regard to their properties, as 

 done e. g. by Brauner; 16 or by the more convenient way 

 of simply ignoring them and writing into the proper 

 place of the system: "Ce etc.," as is the usual and cus- 

 tomary method of procedure. 



Our present knowledge enables us now to make the 

 assumption that the rare gases are so to speak the ter- 



