66o 



TRANS. ST. LOUIS ACAD. SCIENCE. 



R?<C/2(NH;.), and all ruthenio-di- 



ammonium salts, 

 H^RuCy^ and all ruthenio-cyanides 



Ru is -(-3 in 

 Rf^gOg and all ruthenious salts, 

 Ru^Sg, laurite. 



Ru is -|- 4 in 

 R«02 and all ruthenic salts. 



Rw is -f- 6 in 

 K2RKO4, potassic ruthenate. 



Ru is +7 in 

 KRwO^, potassic per-ruthenate. 



Ru is + 8 in 

 R^/O^, ruthenium tetroxide. 



PALLADIUM. 



Atomic weight about 108.* 



Prf is -H I in 

 Pd^O, palladium suboxide, 

 PdnS, " subsulphide. 



Pt/is+2in 

 PdO and all palladious salts, 

 PdCloi^Hs)' and all ammonio-pal- 

 ladium salts. 



Pd is -|- 4 in 

 Pd02 and all palladic salts, 

 PrfSg, palladium disulphide, 

 N^aP'^Sj, sodic thio-palladate, 

 PdH^, palladic hydride. 



SILVER. 



Atomic weight 107.675 ± .0096. 



A^ is 4- J in 

 A^40, silver suboxide, 

 A^gCA " subchloride. 



A^ is -f- r in 

 A^.O and all argentic salts. 



A^is -\- 2 in 

 Aff2^2^ silrer dioxide. 



A^ is + 3 in 

 (A^Aa)2Tc3, sylvan ite. 



CADMIUM. 



Atomic weight 1 11.835 ± -024. 

 Cd is -|- 2 in 

 CdO and all cadmic salts. 



INDIUM. 



Atomic weight 1 13.398 rh •047« 

 I« is -}- 3 in 

 I«203 and all indie salts. 



TIN. 



Atomic weight 117,698 i; .040. 

 S« is + 2 in 

 S«0 and all stannous salts, 

 SwgP^, stannous phosphide, 

 KjSwO^, and all stannites. 



S« is + 4 in 

 S«02 and all stannic salts, 

 K2S«03 and all stannates. 



ANTIMONY. 



Atomic weight 122.46. 



The investigations of Dexter, Du- 

 mas and Kessler all point to a high 

 value for the atomic weight of S^, 

 while those of Cooke point to a 

 value not above 120. The number 

 obtained by Dexter,t 122.46, gives 

 the atomic heat 6.22. 



Si^ is — 3 in 

 HgS^, hydric antimonide, 

 Kff^Sb, argentic " 

 N/S3, nickelic " 



S3 is -|- 3 in 

 SijOg and all antimonites, 

 S32S3 and all thio-antimonites, 

 S^gS^si antimonious selenide, 

 SdFg, " fluoride, 



S3C/3, " chloride, 



SiB^j, " bromide, 



Sbl^, " iodide, 



* Berzelius {Pogg. Ann.S,\']';, 1826) analyzed KaPrfCA and obtained values vary- 

 ing from 104.7 to 110.8, the mean of wrhich was (0 = i6) 107.6. These figures are evi- 

 dently of little value, yet they are sufficient to justify using the round number, 108, until a 

 more accurate determination is made. 



t = 16, Pogff. Ann. 100, 563. 



