RUTHENIUM. 259 



From per cent, of metal Rh := 104.054 



•' " KCl " := 104.046 



" " CI3 " = 104.065 



" Rh : Clg ratio " = 104.057 



" Rh : KCl ratio " = 104.051 



Mean " = 104.055 



If = 16, this becomes Rh = 104.285. 



RUTHENIUM. 



The atomic weight of this metal has been determined 

 only by Clans.* Althongh he employed several methods 

 the onl}^ results worthy of present notice come from the 

 analysis of potassium rutheniochloride, KjRuClg. The 

 salt was dried by heating to 200° in chlorine gas, but even 

 then retained a trace of water. The percentage results of 

 analysis are as follows : 



28.96 40.80 30.24 



28.48 41.39 . 30.22 



28.91 41.08 30.04 



Mean, 28.78 41.09 30.17 



Reckoning directly from the percentages we get the fol- 

 lowing discordant values for Ru : 



From percentage of metal Ru = 103.016 



" " KCl " = 107.190 



CI3 " = 96.854 



Obviously, the best result is to be obtained from the ratio 

 between Ru and 2KC1. This gives Ru = 104.217 ; or, if 

 = 16, Ru = 104.457. But little weight can be attached 

 to this determination. 



* Journ. fiir Prakt. Chem., 34, 435. 1845. 



