Manchester Memoirs, Vol. li. (1907), No. {>. 



Elements. 



Atomic 

 Weights. 



Group 

 Position. 



Calculated 

 At. Wt. 



Difference. 



Group VI I L. 



Mean position, 7-59. 



Neon 



Ne 



20'00 



7-42 

 7-69 



20-30 

 53-52 



io2'68 



-0-30 

 + 0-18 



Nickel 



Ni 



587° 

 103-00 



Rhodium 



Rh 



+ 0-32 



Iridium 



Ir 



I93-00 



7*22 



194-04 



— 1*04 





Group VIIL. 



Mean position, 7-80. 



Cobalt 



Co 



59-00 



775 



59-16 



— o*i6 



Palladium 



Pd 



io6'oo 



875 



103-30 



+ 270 



Platinum 



Pt 



194-80 



7-85 



19465 



+ 0-15 



Group IX. 



Mean position, 9'29. 



Sodium 

 Copper 

 Silver . . . 



Gold 



Na 



23-05 



9-17 



23 -2 5 



Cu 



63-60 



9-28 



6 3'55 



Ag 



107*93 



9-42 



107-50 



Au 



197-20 



8-70 



198-76 



+ 0-05 

 + 0-43 



-156 



