CHEMICAL NOMENCLATURE 



275 



The equation for the preparation of chlorine is frequently 

 written in two stages : 



(1) MnO, + 4HC1 = MnCl 4 + 2H 2 O 



(2) MnCl 4 = MnCl 2 + Cl 2 . 



This indicates that an intermediate compound (MnCl 4 ) is 

 formed, which, however, decomposes to form a lower chloride 



TABLE OF ELEMENTS WITH THEIR SYMBOLS AND ATOMIC 

 WEIGHTS. 



T 2 



