Abstract
The systems with which we have dealt up to now can be labeled elementary systems as they contain few electrons in few orbitals. A more specific definition of the term “elementary system” is not useful because any large system can be viewed as a composite of elementary systems of arbitrary complexity. As we have seen, a ground elementary system can be represented by a bond diagram which constitutes the pictorial depiction of the corresponding optimal ground state wavefunction, Ψ. We now seek an approximate representation which makes evident how bonds are made in an elementary system which is more complex than those we have already discussed.
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