Mixter — Thermochemistry and the Periodic Law. 527 



Fig. 3. 



340 



R0+H,0 



Mg Ca Zn Sr Cd 



Ba 



Hg 



Fig. 8. Diagram of Group IT. The heat equivalents of calcium, strontium, 

 and barium are on the heavy lines, of the other elements of the groups on 

 the light lines. 



