xv THE MOLECULAR THEORY 



3. CHLORINE COMPOUNDS. Cl 35*5. 



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The smallest weight of chlorine in the table is 35*5. 

 This is therefore taken as the atomic weight of chlorine. 

 The weight of the molecule is 71; it therefore contains 

 (like the hydrogen molecule) 2 atoms, and is represented 

 by the formula C1 2 . 



4. NITROGEN COMPOUNDS. N = 14. 



The atomic weight of nitrogen is seen to be 14. The 

 gas is again "diatomic," containing two atoms in each 

 molecule, and is represented by the formula N 2 . 

 1 See later, p. 529. 



