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Has a single atom ever been photographed or seen?
Why Not?
Yes. This is an image where the individual atoms in a silicon crystal are visable.
Astrophysics Kid
Well, at least, that's where they PROBABLY were when the image was taken.

Thank you, Heisenberg and associated wave-functions.
2confused guy
I'm not so sure. Unless my information is off, the closest we've gotten is a 3-D picture of carbon atoms, and each bump is the appoximate location of the atom.
That image using a TEM was impressive. I did not know that TEM's could probe that small. Current STM's are often imaging single atoms. Remember, that when measuring a single atom's position what you are measuring is the electron cloud. All interactions are electronic interactions. Also, on the scale of atoms, and in crystal structures, the uncertainty principle does not bring our uncertainty down that much.
Just remember that you will never be able to see an atom with conventional light as visible light cannot resolve objects that small. TEM's, STM's etc infer the existence of the atoms based on a property of the atom (charge density etc)

I'll never forget when I was in my first unit on Quantum and a student put their hand up and asked if a hydrogen atom was a different colour to a oxygen atom.
That is a more profound question than you may realize.
Some scientests that work for IBM lined up some atoms that spelled out "IBM" once. They took some pictures of them. Actually happened. Cool.

Here's the link
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