A: put an atom on a poster in the exhibit
   Good luck. The poster itself is made of trillions of trillions of trillions
   of atoms. You could not see the extra one any easier than you could
   see the ones that are already there, and even if you could, it would be
   lost in the crowd.
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B: use a life size drawing of an atom
   Good luck. Nobody has ever seen an atom. Atoms are too small
   to see. That's a big part of the reason that nobody knew they exist
   until less than 200 years ago.
D: set up a microscope so that visitors can view atoms
   Good luck. Atoms are way too small to see with a microscope.
C: Display a large three dimensional model of an atom.
   Finally ! A suggestion that makes sense.
   If something is too big or too small to see, show a model of it
     that's just the right size to see.
