The question should not be, what element, but what isotope. Several easily fissible isotopes are used, such as Uranium-235. But note that the element Uranium as such is not usable - only that specific isotope.
Uranium is a radioactive element used to fuel nuclear reactors. It is a nuclear fuel.
One metallic element commonly used in nuclear power plants is uranium. It is used as fuel in nuclear reactors to undergo fission and produce energy. Another metallic element used in nuclear plants is zirconium, which is used to make fuel rods that house the uranium fuel.
The element used as a fuel component in most nuclear reactors is uranium. Specifically, uranium-235 is the primary isotope used for nuclear fission reactions in nuclear power plants.
To make fuel rods for nuclear reactors
Uranium I think
Gold is a very stable element and would be no use as nuclear fuel
B. Uranium
Th, element 90, spelled thorium, is an actinide and has been used as a nuclear fuel (see Wikipedia.)
We look to the naturally occurring element uranium as a nuclear fuel.
Uranium mostly, sometimes a mixture with plutonium
The element most commonly used as a fuel in nuclear fission reactions is uranium-235. It is a naturally occurring isotope of uranium that can sustain a chain reaction under controlled conditions in nuclear reactors.
Uranium is the primary fuel used in nuclear power plants. Specifically, uranium-235 is the isotope that undergoes nuclear fission to generate heat in these plants.