Haei 



Fig. 2 



Phil. Mag. Ser. 6, Vol. 42. PJ. XII. 



Fig. 3. 



EfOPiC NUMBERS 



\PIC NUMBER -S 



V23 mn 2S Co zl Cu % 



160 





^ !! 120 



Si 



Nuclear 

 Posit we Electrons 



as a function of the A— ■ 



Net Nuclear Charge 



too 



60 



w 



20 



f the Atomic Number (M). (The slanting 

 ^.Indicates that P is alwajs equal to or greater 

 jf Jrogeu, and of Rutherford's isotope of helium.) 



17 IS .19 20 2\ 



>e on Nucleus = / 



.t Atomic Species are : 

 he latter, but ou a mucl 



60 10 



so so 



