What nuclear elements are used in fission?
Elements much heavier than iron produce energy when split apart.
Elements much lighter than iron produce energy when fused together.
Basically, any heavy nucleus (I'm not exactly sure where the cutoff is -
certainly, any nucleus heavier than lead) can release energy upon fission.
There are only three nuclei, however, that can be used to generate nuclear
power in conventional nuclear reactors, or to make nuclear weapons. These
are the fissile nuclei, those that undergo fission upon absorption of
thermal (slow) neutrons. These nuclei are uranium-233, uranium-235, and
Richard E. Barrans Jr., Ph.D.
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Update: June 2012