HEREDITY 

 TABLE OF MENDELEEF 



189 



H' 



FIG. 21. 



combine with oxygen, according to the typical 

 formula, E 2 O 2 , K 2 O 3 , R 2 O 4 , E 2 O 5 , R 2 6 ,R 2 7 ; that 

 is, the elements of one and the same column form 



