http://users.accesscomm.ca/john/bluepath.GIF
shows the pathway shared by two atoms- one can
see the unused loops between them.
Now
http://users.accesscomm.ca/john/gridpath.GIF
shows how in cubic-packed crystals, the loops
between *all* the atoms would be dropped, and the
shared orbital continues from one border to the
other. This means that in the crystal, electrons
will run in eight directions from every point.
John
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