TO STROMEYER, Grouping of Chemical Elements. 



Elements. 



Atomic 

 Weights. 



Group 

 Position. 



Calculated 

 At. Wt. 



Difference. 



Group XV. 



Mean position, 15*17. 



Chlorine 

 Bromine 

 Iodine . 



CI 



35*45 



i5"36 



34*98 



Br 



79-66 



i4"97 



80-18 



I 



126-85 



i5"67 



125*31 



+ 0-47 

 -0-52 



+ 1-44 



Group I. or XVI. 



Hydrogen, 14-96. 



Hydrogen 



H 



i - oo8 



14-96 



i-oo8 



An examination of the table shows a close agreement 

 between the actual and the calculated atomic weights, the 

 greatest discrepancies being those for Uranium, Thorium, 

 Barium, Erbium, Cadmium, Radium, and Argon on the 



