Haughton — Notes on Newtonian Chemistry — V. 289 



The stability of the compound molecule is measured by its centri- 

 fugal force, which is co'V ; but the centrifugal force of the hydrogen 

 molecule is represented by unity ; therefore we have the condition 



o)'V' > 1, or w'V^ > 1 ; 

 which gives finally, substituting for w' and r', the preceding values, 



the equation 



/3 (mr + y8)3 > (/3 + 1 ) TOi* (mi + fi)\ {c) 



We are now in a condition to determine the constants of hydro- 

 fluoric, hydrochloric, hydrobromic, and hydriodic acids. 



Hydrofluoric Acid. — The configuration of the monad elements 

 combined with hydrogen is shown in the following figure. 



In the case of fluorine, yS = 19, and equations {a) and {h) become 



{a) 



^ 19 (»h+19r- 

 20 OTi2+ 19 ' 



«?l-4-19 



mi{mi + 19) 



K.I. A. PKOC. SEI{. III., VOL. III. 



