332 



Dr. J. R. Rydberg on the Structure of the 



Element ... 



B. 



Al. 



Ga. 



In. 



Tl. 



P 



10-9 



27-04 



699 



113-4 



203-7 



v 



10-5 



109-6 



823-6 



2212-4 



7784-2 



100 v 

 P 2 



8-84 



14-99 



16-86 



17-20 



18-76 



In accordance with analogy, the spectral lines of Li (the 

 one element, besides H, in which only single lines are ob- 

 served) ought to be double with j/=0*8, corresponding, for 

 instance, in the red hue (\= 6705*2) to a difference in X of 

 Oo6 tenth-metre. The most refrangible of the components 

 should also be the strongest. 



The elements of the groups I. and III. (atomicity odd) 

 have only doublets • triplets are found in the elements of 

 group II. (atomicity even). As examples may be cited the 

 doublets of Tl and the triplets of Hg, 



Thallium. 





v.. 



5349-5 



3528-3 



3229-0 



2921-3 



2825-4 



2710-4 



2669-1 



2609-4 



2552-0 



25170 



V ... 



7792-6 



7796-6 



7794-9 



7785-5 



7766-1 



7773-9 



7783-1 



7781-2 



7794-2 



7780-7 



x 2 ... 



3775-6 



2767-1 



2579-7 



23800 



2317-0 



2238-7 



2210-0 



21690 



2128-6 



2104-8 



Mercury. 



\ 



* 2 



x 3 ...... 



5460-5 



4633-0 



4358-0 



1763-4 



4047-0 



3662-9 



4644-0 



3130-4 

 1766-1 

 2966-4 



3341-2 



4638-0 



2892-9 

 1776-4 



2751-5 



30210 



4602-9 



2652-2 

 1761-9 

 2533-8 



2925-2 



4644-7 



2575-3 



1759-0 



2463-7 



2798-5 



4626-6 



2477-7 



With the triplets the ratio of the two constant differences — 



increases from 2*01 in Mg to 2*63 in Hg. Also with these 

 elements (of group II.) there are doublets, which follow the 

 same rule as the others ; the value of the difference v Q in these 

 doublets is about 2*2 times as great as the first difference v x 

 of the triplets in the same element. For example, we have: — 



