664 



TRANS. ST. LOUIS ACAD. SCIENCE. 



T/2S3, thallic sulphide, 



KT/S2, potassic thallic sulphide. 



LEAD. 



Atomic weight 200.47 ± -02. 

 R3 is 4- I in 

 PijO? plumbous oxide, 

 Pl>2S, " sulphide. 



P3 is + 2 in 

 P30 and all plumbic salts, 

 P^S, plumbic sulphide, 

 KgP^Oa and all plumbites. 



P*is+3 in 

 P^o^s' ^^^^ sesquioxide. 

 Pb is +4 in 

 P^Oj and all plumbates, 

 P3C/4, lead tetrachloride. 



BISMUTH. 



Atomic weight 207,523.* 



B/ is 4- 2 in 

 Bi^02, bismuth monoxide, 

 B/2S2, " monosulphide, 



B/C/2, " dichloride, 



B/^OgC/j, "• trioxydichloride, 

 BrjOgS, karelinite. 



Bt is -f- 3 i" 

 B/VOs and all bismuthic salts, 

 Bz'oSg, bismuthic sulphide, 

 B/aScj, " selenide, I 



In the following list of compounds 

 any certainty : 



B?'2Te3, bismuthic teiluride, 

 B/'SC/, " thio-chloride, 



B/ is -|- 4 in 

 B/oO I, bismuth tetroxide. 



Bi is + s in 

 B/2O5 and all bismuthates. 



THORIUM. 



Atomic weight 232.0.! 



T/i is -)- 4 in 



T^02 and all thorium compounds.. 



URANIUM. 



Atomic weight 239. 



U is +3 in 

 UgC/,;, uranium sesquichloride. 



U is -j-4 in 

 UO2 and all uianous salts. 



U is +5 in 

 U2O5, uranium pentoxide, 

 UC/5, uranium pentachloride. 



U is +6 in 

 UO3 and all uranates and uranyl- 



salts. 

 UO2S, uranyl sulphide. 



Uis -f Sin 

 UO4, uranium tetroxide. 



U is -|- 12 in 

 Kj^UOs, potassic peruranate, 

 Na^UOs, sodic " 



the valence cannot be stated with 



Schneider, Pogg. Ann. 82. 303, 



i Nilson, lierichte. rs, 2527, 1S8 



