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Uranium-235
Uranium-235
(
235
U
) is an
isotope of uranium
making up about 0.72% of
natural uranium
. Unlike the predominant isotope
uranium-238
, it is
fissile
, i.e., it can sustain a
fission
chain reaction
. It is the only fissile isotope that is a
primordial nuclide
or found in significant quantity in nature.
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