Hatjghton — Notes on Newtonian Chemistry — V. 295 



The best solution for HS would be 



mi = - 15, 



/ = 1-04424, /^ = S2, 

 to'- = 1-01574, 

 co'2/ = 1-06068. 



This explains why HSU makes its appearances and not US. 

 The attraction of an atom of sulphur upon an atom of hydrogen 

 at the unit distance is, in HS, 



a'B = f^^Y/^co'^ = 1-2300. 

 \ {3 J 



The attraction in HSH, is 



lx"/3 = (o"2- 1 = 0-2844, 



being less tban one-fourth the attraction in HS. 



Selenuretted Hydrogen (HSeH). — If we suppose r" = 1, we find, 

 /3 = 79, 



m^ = ^-^ = - 19i. 

 This gives us ,'..1.1065. 



The most favourable value for HSe would be 



77 

 mi = - — , /3 = 79, 



r' = 1-02681, 

 co'2 = 1-00256, 

 ui'^r' = 1-02955. 

 (HSe)/><.'/8 = Ml 30, 

 (HSeH) ix"(3 = 0-1065, 



being less than one-eighth the attraction in HSe. 



