[eve] 



IONIZATION POTENTIAL AND SIZE OF ATOM 



39 



Group VI 



In the first group of the periodic table the products shown in 

 each of the fourth and sixth columns of the above table are fairly 

 concordant so that we may conclude that, the work done in the 

 removal of an exterior electron is nearly proportional inversely as 

 the radius. 



The same remark applies to four elements of the second group 

 while the members of subgroup B diverge considerably from the 

 values for the A group. According to Urbach {Phys. Zeit., Feb., 

 1921, p. 116) the B subgroup have a double ring of electrons in the 

 outer zone, while the A subgroup have a single ring. In the case 

 of the inert gases, neon and argon, the diameters estimated by Bragg 

 give products in the fourth column in far better accord with theory 

 than those found from the cube-roots of the atomic volumes set forth 

 in the sixth column. 



