^54 



TRANS. ST. LOUIS ACAD. SCIENCE. 



N is + I in 

 N2O, nitrous oxide, 

 KNO and all hyponitrites. 



N is -f- 2 in 

 NO* and l>i.,0,*, nitric oxide, 

 NS, nitrogen sulphide, 

 NSe, " selenide. 



N is -}- 3 in 

 NoO^ and all nitrites, 

 NOC/, nitrosyl chloride, 

 NOBr, " bromide, 

 NSC/O4, nitro-sulphonic chloride, 

 HNSO5, " acid, 



N2S2O9, " anhydride. 



N is -}- 4 in 

 NOot and No04t, nitric peroxide. 



N is 4- 5 in 

 NjOg and all nitrates, 

 NO.,Cl, nitrosyl oxychloride. 



OYGEN. 



Atomic weight 15.9633 ± -0035. 



O is — 2 in all compounds with other 



elements. See p. 664. 



FLUORINE. 



Atomic weight 18.984 rb .0065. 

 F is — 1 in all compounds. 



SODIUM. 



Atomic weight 22,998 ± -O"- 

 Na is -|- I in 

 NfljH, sodic hydride, 

 Na^O and all sodic salts. 

 Na is -(- 2 in 

 Na.,G.,, sodic dioxide. 



MAGNESIUM. 



Atomic weight 23,959 Jt: 005. 

 M^ is -}- 2 in all magnesic salts. 



ALUMINIUM. 



Atomic weight 27.009 ± .003. 

 A/ is -f- 3 in all aluminic salts. 



SILICON. 



Atomic weight 28.195 ± .066. 



S/' is -(- 4 in 

 Si'O., and all silicates, 

 S/F4, silicic tetra-fluoride, 

 S/C/4 " " chloride, 



St'Br^, " " bromide, 



St'I^, " " iodide. 



S/ is -(- 3 in 

 SiC/j, silicic tri-chloride, 

 S/'Br^, " tri-bromide, 

 S/I3, " tri-iodide, 

 S/HO2, " hydric oxide. 

 j S/ is -|- 2 in 



S/I2, silicic di-iodide. 



S/ is — 4 in 

 H4S/, hydric silicide. 



PHOSPHORUS. 



Atomic weight 30.958 ± .007. 

 P is — 3 in 

 H3P and all phosphonium salts, 

 C^gP, cuprous phosphide, 

 CW3P2, cupric " 



C03P2, cobaltous " 

 FggPa, ferrous " 



H^3P2, mercuric "• 

 Z«3P2, zincic *' 



N/3P2, nickelous " 

 S«3P2, stannous " 

 W3P4, tungstous " 

 S3P4, sulphurous " 

 FeP, ferric *' 



MoP, molybdic " 



P is — 2 in 

 H2P, di-hydric phosphide, 

 Au.>Fg, di-auric " 

 S«P, stannous " 



P is -f- I in 

 H3PO2 and all hypophosphites, 

 P2S, phosphorus subsulphide. 



Pis + 2 in 

 PI2, phosphorous di-iodide. 



P is 4-3 in 

 H3PO3 and all phosphites, 

 P2S3, phosphorus sulphide. 



* These two bodies are both called nitric oxide, 

 t These bodies are both called nitric peroxide. 



