The Representation of Molecular Species and Reactions between Them

THE REPRESENTATION OF MOLECULAR SPECIES AND REACTIONS BETWEEN THEM 

We shall commonly abuse the language to the extent of abbreviating the phrase the Class I representation of a molecular species si to read the molecular species si . Since we are only concerned with Class I representations this will not cause any confusion. 

Remark 1. If all the atomic coefficients /3 are positive we speak (where necessary) of a proper molecular species. If all the /3( are zero we have the null or trivial species, and if any are negative a pseudo-species.  

Remark 2. The elements are themselves molecular species with /3( = 8 s (Kronecker delta). 

Remark 3. Although the number of elements known to exist in the universe is finite, it is seldom necessary to consider more than a few of them in a particular universe of discourse. Thus large tracts of organic chemistry require only the three elements, carbon, hydrogen and oxygen. 

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The representation of molecular species and reactions between them. 150... 

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