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Fig. 7.7 Indistinguishability of atoms configurations of atoms labeled A1, A2 and A3. The atoms occupy a different set of sites in each and so are distinct. The middle line contains a site on which A atoms occupy the same sites as the configuration in the upper left, the only difference being the order. This middle site is not allowed because the atoms cannot be labeled - they are indistinguishable. Three distinguishable atoms can be permuted 6 (or 3!) ways, and these constitute only one arrangement, shown at the bottom left of Fig. 7.7. Removing the labeling of the atoms on the upper-right-hand configuration gives the single arrangement shown in the bottom right of the figure. To assure indistinguishability, the count arrived at above must be divided by NA!. The correct result for W is:

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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