REED— RELATION BETWEEN VALENCE & ATOMIC WEIGHT. 663 



Hj,P/;WioO.,,; and all platino-tung- 



states, 

 HgP^MoioO;,,; and all platino-mo- 



lybdates, 

 K.P/'C/,, and all chloro-platinates, 

 H,P^(C_)'S)6 and all platinothio-cj- 



anates. 



Fl may be + 6 in 

 P/P., platinum diphosphide, 

 PJSso " di-arsenide. 



GOLD. 



Atomic weight 196.6.* 



Xti is -j- I i" 

 AK2O and all aurous salts, 

 NaAuS, sodic aurous sulphide. 



Am is -f- 2 in 

 A«0, gold monoxide, 

 A?<S, " monosulphide, 

 AaC/o " dichloride. 



A« is 4- 3 in 

 AmjOj and all auric salts and au- 



rates, 

 AuoTe,, sylvanite. 



A« is 4-4 in 

 AuOo, gold dioxide, 

 AwTe,. calaverite. 



OSMIUM. 



Atomic weight about 199. 

 Os is -f 2 in 

 O5O, osmium monoxide, 

 O5SO,, '• sulphite, 

 K^HaO^CSO^Osj osmium potassic 



sulphite, 

 H^05C_j'fi and all osmio-cyanides. 



Os is +3 in 

 O52O3, osmium sesquioxide, 

 K„05.X/i2i potassic osmichloride, 

 (NH^)rt05,C/i2, ammonic " 



Os is 4-4 in 

 OsOo, osmium dioxide, 

 OsC/4. " tetrachloride, 

 K,OsC/,;, di-potassic osmichloride, 



NrtjOsC/,;, di-sodic osmichloride, 

 (NHi);,OsC/,;, diammonic " 



Os is +6 in 

 K2OSO 1 and all osmates, 

 OsOX/^INHj)^, ammonio-osmyl- 

 oxydichlor'de. 



Os is +7 in 

 — 3 

 HXs.,N,,Og and all osmiamates. 



Noie. — In this compound N is in 

 the same condition as in H3N, and 

 not as in NgO.,. This is shown by 

 the following equation : 



+ 8—2 +1-3 +1 —'2 +1 



2O5O4 + 2H3N +2K O H= 



+ 1 +7 -3 -2 ±0 +1 -2. 

 K.Oi-.N.O^ +04- 4H2O. 



Os is +8 in 

 OsO J, osmium teiroxide, 

 OsS^, " telrasulphide. 



MERCURY. 



Atomic weig* t 199 712 i .042. 



H^is4-i in 



H^.>0 and all mercurous and am- 



monio-mercurous salts. 



H^ is + 2 in 



H^O and all mercuric and ammo- 



nio-mercuric salts 

 H^S, mercuric sulphide, 

 H^.jP,, " phocphide, 

 H^sNz. " nitride. 



11^ is 4-6 in 

 H^I,;, mercuric hexiodide. 



Hg- is — 2 in 

 K.,U£; potassic hjdrargyride. 



THALLIUM. 



Atomic weight 204. 

 Tl is 4- I in 

 T/2O and all thallious salts, 

 TloS, thallious sulphide. 



T/ is 4- 2 in 

 T/C/2? thallium dichloride. 



T/is +3 in 

 T/,0. and all thallic salts, 



