﻿Distribution of Electrons in Na and CI Atoms. 443 



numbers of electrons on each shell, and the radii of the 

 shells, are as follows : — 



Sodium, 



7 electrons on a shell of radius 0'29 A. 

 o ,, ,, j, U'/o ,, 



Chlorine. 

 10 electrons on a shell of radius 0*25 A. 

 5 ., . ., „ 0*86 „. 



3 ., „ „ 1-46 ., 



Secondly, we have solved the simultaneous equations for 

 the distribution in shells with several sets of radii, and 

 drawn a smooth curve through the points so obtained in 

 such a way as to represent the density of distribution of the 

 electrons as a continuous function of the distance from 



Fig. 3. 



1 













\ 











I 



1 \ 























/ 





















\ 



\ 



02 0-4 0-6 0-8 1-0 



Distance from centre of atom in Angstrorr 



the atomic centre. The density P is so defined thatgPdr 

 is the number of electrons whose distance from the centre 

 lies between r and r+dr. The curves which we obtain for 

 sodium and for chlorine are shown in figs. 3 and 4. The 



