[edw519]

I know what you're thinking. "Does the nucleus have six electrons or only five?" Well, to tell you the truth, in all this uncertainty I kind of lost track myself. But being as this is an isotope of uranium, responsible for slow-neutron fission, and would blow your city clean off, you've got to ask yourself one question: Do I feel lucky? Well, do ya, punk?

[rubinelli]

Hah, this is a trick question; the nucleus doesn't have electrons. And if it blows up, you don't bury the survivors.

[InclinedPlane]

Hah, this is a trick question; the nucleus doesn't have electrons.

Well, technically, in an s-orbital there is a substantial, non-zero chance of the electron being inside the nucleus.

[graphene]

Not true, you may have been thrown off by the fact that s orbitals are generally shown as spheres; but the radial extent (probability amplitude) of the wave function goes to zero for small radii, for all s orbitals, see http://www.chem.umass.edu/people/botch/Chem121F06/Chapters/C....

A classically-behaving point particle with the same charge as an electron would drop into the nucleus, but the wave nature of real electrons forbids it. Due to the uncertainty prinicple, there is a nonzero chance of finding the electron in the nucleus, but to say it is substantial is false.