Ordinals or Atomic Numbers ? 



G31 



Nor do ordinals give as good values as atomic numbers in 

 all cases where proportionality to some function of these 

 must be expected from the hypothesis proposed by the 

 author* that the charge of the nucleus is for all elements 

 equal to these numbers. 



So the small-angle scattering of a. particles by gases (III.) 

 proved by Rutherford and Nuttall f to depend on the atomic 

 numbers, the scattering of Rontgen rays (IV.) shown by 

 Barkla, Crowther, and others to be, with the usual exception of 

 hydrogen, roughly proportional to the atomic weight, and the 

 absorption ofH-particles (Marsden), the amounts of the various 

 materials required to produce the same absorption being 

 roughly proportional to the square roots of the atomic weights. 

 From Tables III.-V., where the original values given by the 

 authors have been reduced to a mean of 100 for each set, 



I. y rays'ofEaB(82). 



II. Characteristic 



X-radiation (Moseley's L a ). 





e(M±n/2). 



M. L«. 



a'(M-6'5). «(N-9). 



0-793 0-3459 . 98 



Zr ... 40 6091 



0-3653.33 5 = 03708.33 





0-809 0-3461 . 97 



Nb... 41 5-749 



0-3650.34-5 = 03704.34 





0-838 0347 1 . 95 



Mo... 42 5423 



03653.35-5 = 0-370* 





0853 03459 . 94-5 



Eu ... 44 4-861 



0-3653.37-5 = 03702.37 





0-917 0-3464 . 91 



1th ... 45 4-622 



03648.38-5 = 0-3696.38 





953 03474.90 



Pd ... 46 4385 



0-3650.39-5 = 0-3697.39 





0-982 0-3462.88 



Ag ... 47 4-170 



3651.40-5 = 0-3697.40 





1-H06 -.",460. 87 



8n ... 50 3-619 



0-3649.435 = 03691.43 





1029 0-3462.86 

 1-055 0-3459.85 

 1-074 03469 . 84 

 1100 0-3471.83 



Sb ... 51 3-458 



0-3649.44-5 = 03690.44 





La | 57 | 2*676 



I 0-3092-5 1 Kydberg's 





1-141 3464.815 



Cd J 64 J 2057 



. 57 J senes - 





1-175 0-3460.80-5 



W ... 74 1-486 



0-3697.157 A.fN-9) 





1-196 0-3472.79-5 

 1-219 0-3462 . 79 

 1-266 03463 . 77-5 

 1-286 0-3458 . 77 

 1-315 0-3463.76 

 1-349 0-3464.75 

 1-365 03470 . 74-5 



Au... 79 1-287 



0*3697.72 a(M-7) 





Dy ... 66 1-914 



a"(M-7-5). a(N-9). 

 0-3731 . 58-5 = 0-3699 . 59 



Er... 68 1-790 



Ta ... 73 1-525 



03731 .60-5 = 3700.61 

 0-3733.65-5 = 0-3705.66 





Os ... 76 1397 



Ir ... 77 1354 



0-3730.68 5 = 0-3703 . (59 

 03734.69-5 = 03707.70 







Pb... 78 1-316 



0-3733.70-5 = 0-3707.71 





III. («-part.). W. O. 



M 



IV. (X-rays). 



W. O. M. \V. (H-part,). W. O. M. 



11 0-0176 252 209 



128 



H 0-0725 159 129 101 I Al 0-0108 115 105 109 



He 0064 64 47 



117 



He 016 



88 73 110 Cu 00 132 91 89 90 



C 040 47 74 



83 



N 0-485 



76 98 95 Sn 0-0180 91 94 92 



N 048 39 70 



72 



O 0560 



77 100 96 Pt 0-0266 103 1 



2 109 



* Nature, July 20, 1911, and Nov. 27, 1913. 

 t Phil. Mag-, xxvi. p. 702 (1913;. 



