To face p. 144.] 



H4w 



H6>/ H6« H7? 



27 



F 



39 



96 



^3 



50 



77 



D4 



31 



16 



32 



B = 10 



— = 18 



N = 14 



P =30 - = 36 



Ti = 48 V = 50 



Cr = 54 



Ge = 



72 



As 



75 



Zr =: 92 



Sn =116 



La = 140 



- =165 



D =188 



U =240 



Nb= 95 



Mo= 96 



Sb ==1 



20 



Si = 



35 



Fe = 



56 



Mn = 



S6 



iNi = 



56 



Co = 



56 



Pd =105 

 Eh =:io5 

 Ru = 105 

 Da = 105 



56 

 55 

 58 

 58 



106 

 105 

 105 



— = 140 



- =165 



144 



Ta .= 185 W =186 



Bi =210 



Au = 196 

 Pt =196 

 Ir = 196 

 Os =196 



196 

 197 

 197 

 198 



