66: 



TKANS. ST. LOUIS ACAD. SCIENCE. 



S;« is f 3 in 

 S»«,0.j, samarium oxide, 

 Stnli^O^),, " sulpliate. 



ERBIUM. 



Atomic weight 171.* 

 Er is -^-3 in 

 Ey.O,, and all erbic salts. 



YTTERBIUM. 



Atomic weight about 173.! 

 Y^ is + 3 in 

 Y/^ ,0;5 and all ytterbic salts. 



TANTALUM. 



Atomic weight 182C?). 



T« is -f 3 in 

 T«N. tantalous nitride. 



Ta is -f-4 in 

 TaOn, tantalum di-oxide, 

 T«S2 " disulphide. 



Ta is -H 5 in 

 TtioO-^ and all tantalates, 

 TrtF.5 and all tantalo-fluorides, 

 TrtC/5, tantalic chloride, 

 Trt:,N5, " nitride. 



TUNGSTEN. 



Atomic weight about 184. J 

 W is 4- is 2 in 

 WC/2' tungsten dichloride, 

 AV'Bro, " dibromide, 



\VI,, " di-iodide, 



VV.N^, '• nitride. 



W is -f- 4 in 

 WO2, tungsten dioxide, 

 WS,, " disulphide, 



WC/4, " tetrachloride, 



W.P4, " tetraphosphide. 



W is +5 in 

 WC/5, tungsten pentachloride, 

 WBr-, " pentabromide. 



Wis 4-6 in 

 WO3 and all tungstates, 

 WS;, andallthio-tungstates, [states 

 HsP/WioOge and all platino-tung- 

 H.SiWioOge and all silico-tung- 

 states, 



HiiPWicO:jh and all phospho-de- 



catungstates, 

 K,,WO„F.,, potass, tungsto-fluoride 

 WC/g. tungsten hexchloride, 

 WOC/4, tungstyl tetrachloride, 

 \VO.,Cl., " oxjchloride, 

 VVOoBr.,, " oxybromide. 



IRIDIUM. 



Atomic weight 193 o.j 



I?- is -j- 2 in 

 lySO:, and other iridium subsalts, 

 IrS, iridium monosulphide. 



I^-is +3 in 

 l^'.Oj and all iridious salts, 

 1^28.1, iridious sulpl.ide, 

 HjIrCjt; and all iridicjanides. 



Ir is + 4 in 

 Ir02 and all iridic salts, 

 IrS.,, iridic sulphide. 



PLATINUM. 



Atomic weight about 195.! 



Pif is + I in 



P^2(OH)2(NH;,)4 and all diplato- 



diammonium salts. 



P/ is -j- 2 in 



PzfO and all platinous and ammo- 



nio-platinous salts, 

 K2P^C/4 and all chloro-platinites, 

 K,P/(N02)4 and all platino-nitrites 

 H2P^Cy4 and all platino-cyanides, 

 H,P/(C_>'^)4 and all platino-thio- 



cyanates, 

 P^S, platinous sulphide. 

 P/ is -f 3 in 

 P/.J,. (NH;)^ , diplatinammonium 



iodide, 

 P/.J,;(NH;J8 and all diplatin - te- 



trammonium salts, 

 P^2S:,, platinum sesquisulphide. 



P/fis+4in 

 P/O., and all platinic and ammonio- 



platinic salts, 

 PAS., platinic sulphide, 



* Hoeglund. K. Svenska. Vet. Akad. Handhngar, 

 irney Jour. Chem. Soc, Feb.. 1879. P- '»^- 

 t Nilson, Compt- Rend., 91, 56, iSSo. 



no. 6; 



also Humpidge and 

 X O = 16. 



