— 169 — 

 Sauerstoff-Proportionen: КЮ', RO', КЮ', 



с, • к 17 I ^ л ^ As*0^ Sb^O' Bi^O' 

 bterische bormein der Oxyde: — - -rr-, —r-r-i — г т"» 



J 12 1111 



As ^ О' Ya^ O^ 



Г1,33'Т1,33* 



Krystallform der Metalle: 



As 



-г- rhomboëdrisch а : с: = 1 : 1.4025 

 1 



1 



d' а:с:= 1: 1,3068 



-2L d' a:c:= 1 : 1,3035. 



1 



9) Wolfram-Gruppe. 

 (At. Vol. 11,0.) 



W 



Wolfram , . 



11,0 



Molybdän C^^ 

 Sauerstoff-Proportion: RO, R0^ R-0\ RO^ 



10) Zinn-Gruppe. 

 (At.- Vol- 14 + 2.) 

 Titan {^^ 14. 

 Zinn (^\ (14 + 2) = 16. 

 Sauerstoff-Proportion RO, RO'. 



