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TRANS. ST. LOUIS ACAD. SCIENCE. 



T/ is -|- 4 in 

 T/O2 and all titanic salts, 

 H^T/Fg and all titano-fluorides. 



Note. — In order to conform to the 

 law (see note on Sc) T/ should form 

 either a tri-oxide, Tz'Og, or a series 

 of salts corresponding to the form- 

 ula K2T/O4, which would bring it 

 into closer relation to the S group. 



VANADIUiM. 



Atomic weight 51.256. 

 Vis + i in 

 V^O, vanadium monoxide. 



V is -(-2 in 

 V2O2} vanadium dioxide, 

 V2C/4, " dichloride. 



V is +3 in 

 V^^Oj, vanadium trioxide, 

 VaC/g; " trichloride, 

 VoB^g " tribromide, 

 VOC/, vandjl monochloride, 

 VN, vanadiuna nitride. 



V is 4-4 in 

 V2O4. vanadium tetroxide, 

 V202(OH)2 and all hjpovanadic 



salts, 



K2V4O9 and all hypovanadates, 



VC/4, vanadium tetrachloride, 



VOC/21 vandjl dichloride (hjpo- 

 vanadic chloride), 



VOB/-2, vandjl dibromide (hjpova- 

 nadic bromide), 



V2S4, vanadium tetrasulphide. 

 Vis +5 in 



V2O5 and all vanadates, 



VOC/3. vandjl trichloride and all 

 true vandjl salts, 



KgV^OjgFg and all fluo-oxjvana- 

 dates, 



VjSj, vanadium pentasulphide. 

 V maj be -f- 6 in 



VN2, vanadium dinitride. 



Note. — With the atomic weigh 

 given above, V, in order to conform 

 to the law (see notes on Sc and T«'), 

 ought to form a pervanadate, KVO4. 

 V would then be a connecting link 

 between N and C/. 



CHROMIUM. 



Atomic weight 52.1292b .125. 

 Cr maj be — i in 

 PCr, phosphorous chromide. 



Qr is -|- 2 in 

 Cr(OH) 2 and all chromous salts. 



Q,r is -|- 3 in 

 Q.r jOr^ and all chromic salts, 

 2,7iQi\0 j^ and all chromites, 

 CrN, chromic nitride('?), 

 ^^2^3? " sulphide. 



Cr is -j- 6 in 

 CrOj and all chromates, 

 C^02C/2 and all chloro-chromates, 

 CrFg, chromium hexfluoride. 



Cr is -+- 7 in 

 0^287, chromium heptasulphide, 

 HC/-O4, perchromic acid. 



MANGANESE. 



Atomic weight 54.95.* 



M« is -|- 2 in 

 M«0 and all manganous salts. 



M.n is -)- I in 

 M«.(04, trimanganic tetroxide. 



M« is -f 3 in 

 M«203 and all manganic salts. 



M» is -|- 4 in 

 MwOj, manganese dioxide, 

 M«S2, " disulphide, 



M«F4, " tetrafluoride, 



M»C/4, " tetrachloride, 



K2MM5O11 and all manganites. 



M« is -|- 6 in 

 K2M«207 and all manganates. 



Mm is 4-7 in 

 ^njd. and all permanganates, 

 MmOjC/, permanganic oxjchloride. 



* Dewar and Scott, Chem. Nevis, vol. 47, p. 98. See also Marignac, Arch des Sci. Phys. 

 et Nat. (3), 10, 21. 



