496 Hackh — Modification of the Periodic Table. 



density and this fact can even be extended to the allo- 

 tropic forms of the elements. Table V represents a 

 section of the main table in which the density of the 

 allotropic forms of some elements are placed. These 





^- <- <r <r 



>• ^ > ^ 







Pb 



Bi 









Nt 





Ra 





Th 



* 



600.5 



544. os 









170 





1300 

 ? 





201C 



* 



Sn 



Sb , 



Te 



I 





Xe 



Cs 



Ba 



La 



Ce 



* 



504.9 



902.5 



723 



386.6 





133 



301.5 



1122 



1090 



896 

 ? 





Ge 



As 



Se 



Br 





Kr 



Rb 



Sr 



Y 



Zr 





A 



1231 



770 

 ? 



490 



265.8 





104 



312.1 



1070 



1550 



1990 



* 



Si 



P 



S 



CI 





Ar 



K 



Ca 



Sc 



Ti 



* 



1687 



317.1 



383.3 



169.6 





83.5 



336.6 



1076 



1600 

 ? 



2068 



* 



C 



N 



O 



F 





Ne 



Na 



Mg 



Al 



Si 





4000 

 ? 



62. 6i 



54.7 



40 





20 



371.0 



905.5 



931.7 



1687 



t 



H 





He 



Li 



Be 



B 



C 





14.o8 





1 



459 



1237 



3000 



4000 

 ? 





Ti 



V 



Cr 



Mn 



Fe 



Co 



Ni 



Cu 



Zn 



Ga 



Ge 





2068 



1990 



1823 



1530 



1803 



1751 



1725 



1356 



692.5 



303 



1231 





Zr 



Cb 



Mo 





Ru 



Rh 



Pd 



Ag 



Cd 



In 



Sn 





1990 



2400 



2808 





2225 



2215 



1822 



1234 .c 



594.0 



428. 



504.9 





Ce 



Pr 



Nd 





Sm 



Eu 





Gd 



Tb 



r>y 



Ho 





Er 



Tm 





Yb 



Lu 







896 



i2id 



> 

 110 



1 



600 



? 





? 



? 



? 



? 





? 



5170 





? 



? 









Ta 



W 





Os 



Ir 



Pt 



Au 



Hg 



Tl 



Pb 







3120 



3540 





2970 



2670 



2028 



1335.5 



234.18 



574.5 



600.5 





Th 





U 









2010 





2700 



T = 



t - 273.13 







-> -> <r -> < 



e <- <r <r > 



Table VI. Melting points of the elements (absolute degrees). 



allotropic forms are so placed that they follow the gen- 

 eral direction of increasing density and the result is, that 

 the more metallic allotropes come toward the carbon 

 group, which forms the transition to the metals, while the 



