﻿724 On an Atomic Model icith a Magnetic Core. 



from the point of view of tubes of: force, for we may suppose 

 that a tube of force with one end on the electron has the 

 other end attached to a certain part of the core which carries 

 an equal charge of opposite sign. The suggested arrange- 

 ment appears to be in partial agreement with the views of 

 Stark with regard to the structure of the atom. 



In order to secure agreement with known facts as to 

 spectral series it is necessary to regard /a as constant for one 

 type of state of motion, but as possessing different values 

 corresponding to the different types of state. 



It cannot, of course, be claimed that these suggestions 

 constitute a theory of spectral series, but an attempt has been 

 made to see what modifications may be required in the 

 original assumptions of Bohr in order to obtain a formula 

 such as that of Rydberg for elements other than hydrogen. 

 The introduction of the coefficient /jl renders the structure of 

 the atom somewhat indefinite, for yu, depends on (at least 

 two) factors both at present unknown. It may, however, be 

 possible from a study of the numerical values of this quantity 

 in the case of particular elements, or elements belonging to 

 the same chemical group, to throw further light on the 

 character of these factors. 



Conclusion. 



The atomic model which is suggested in the foregoing" 

 pages consists of a ring or rings of electrons surrounding a 

 central core, having a radius considerably greater than the 

 nucleus of the Rutherford atom and in consequence capable 

 of producing appreciable magnetic forces in its vicinity. 

 The total charge of the core must be equal to ]$e, where N is 

 the atomic number. The magnetic moment of the core arises 

 from the orbital motion of the discrete electrified particles 

 (a particles, /3 particles, hydrogen nuclei or positive electrons) 

 of which it is composed. The diamagnetic properties of the 

 atom arise mainly from the external electrons revolving in 

 orbits whose radius is of the order 10~ 8 cm. The magneton 

 is regarded not as an independent entity, but as a unit 

 convenient for measuring magnetic moments introduced 

 in consequence of the principle of the constancy of angular 

 momentum. 



A consideration of the laws of spectral series suggests 

 that the quantity /a, the ' phase ' of the series, is connected 

 with the angular momentum of the particular part of the 

 core specially associated with the external electron concerned 

 in radiation. A further study of the values of this quantity 

 may lead to a more complete knowledge of the structure of 

 the core. 



