192 Dr. Tycho E:son Auren on 



Table IX. — Distribution of Electrons between the 

 • outer and inner regions. 



0. I. II. III. IV. V. Yl. VII. 



H, 0, 1 He, 0, 2 Li, 0, 3 Be, 0, 4 B, 0, 5 C, 0, 2+4 N, 0, 7 O, 4 : 4 F, 4, 5 



Ne, 4,6 Na, 4,7 Mg, 8, 4 Al, 8, 5 Si, 8,2 + 4 P, 8,7 S, 12, 4 CI, 12, 5 

 Ar, 12, 6 K, 12, 7 Ca, 16, 4 Sc, 16, 5 Ti, 16, 2+4 V, 16, 7 



As appears from the table, elements with similar chemical 

 qualities will in this distribution o£ electrons have the same 

 number of outer electrons — only the elements He and Li 

 form exceptions to this rule, — and the periodicity exhibited 

 by the Mendelejeff scheme comes out plainly. The hypo- 

 thesis of Kossel * regarding the arrangement of electrons in 

 the atom also may be applied here. Instead of 8 electrons, 

 2 or 6 should, however, be the number of electrons which 

 form a stabile outer ring. I will further discuss this 

 question in a following paper. I only want to mention that 

 the cause of the two periods oE 8 elements at the beginning of 

 the scheme seems to be that in the first four rearrangements 

 taking place when the number of electrons is successively 

 augmented, 4 electrons each time pass from the outer to the 

 inner region. 



To draw conclusions from the experiments related here 

 regarding the arrangement of electrons within either of the 

 two regions can hardly be possible. That the electrons of 

 the inner region should be distributed to different rings 

 (K-, L-, M-, etc. rings) is in no way in contradiction to the 

 suppositions made here. Neither seems it unlikely that a 

 similar formation of rings can take place also among the 

 outer electrons. It is evident that the values given for 

 the number of electrons of the different elements in the 

 inner regions do not claim to be absolute, as they apparently 

 only give the difference between the respective atomic 

 number and the number of outer electrons. 



Bragg and Peirce have, for the relation of the atomic 

 number, established the following formula : 



k = K.Z 4 .A.' 52 , (8) 



where K is a constant. Owen f shows that this formula 

 gives better results if the values are corrected for scattering. 



* Kossel, "tJber Molekiilbildung als Frage des Atomliaus," Ami. d. 

 P/iys. xlix. p. 229 (1916). 



t Owen, Proc. Roy. Soc. xciv. no. A 664, p. 552 (1918). 



