





















To face p. 144.] 



I 



+ Un - 



+ H2w - 



H3n 





H4ra 



H5» 



H6w 



H7w 



2 



Li = 7 







Gl = 8 







C = 



[2 



— = 16 



B = 10 



— = 18 



N = 14 



3 



Na = 23 



F 



= 19 



Mg= 24 



= 



= 16 



Al = 



^7 



— = 32 



P = 30 



- = 36 



Si = 35 



4 

 5 



K = 39 

 Cu = 62 



CI 



= 35 



Ca = 40 

 Zn = 64 



S = 



= 32 



Sc = . 

 Ce = ( 



1-2 

 39 



Ti = 48 



Ge = 72 



V = 50 



As = 75 



Cr = 54 



Fe = 56 

 Mn= 56 

 Ni = 56 

 Co = 56 



6 



Rb = 85 



Br 



= 81 



Sr = 88 



Se = 



= 80 



Ga= < 



96 



Zr = 92 



Nb= 95 



Mo= 96 





7 



Ag =108 







Cd =112 







Y =if 



^3 



Sn =116 



Sb =120 





Pd =105 



8 



Cs =131 



I 



= 127 



Ba =136 



Te = 



= 128 



In ==i 



50 



La = 140 



— = 140 



— =144 



Rh =105 

 Ru = 105 

 Da =105 



9 



— =154 







— = 160 







E =I^ 



77 



- =165 



- =165 







lO 



II 



— =177 

 Hg =200 







— =184 

 Pb =208 







Tl =2 



Th =2: 



51 



D =188 

 U =240 



Ta =185 

 Bi =2X0 



W =186 



Au =196 

 Pt =196 

 Ir =196 

 Os =196 





























56 



55 

 58 

 58 



ro6 

 105 

 105 



196 

 197 

 197 

 iq8 



