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Isotopes of uranium
Uranium
(
U
) is a naturally occurring
radioactive
element that has no
stable isotopes
but two
primordial isotopes
(
uranium-238
and
uranium-235
) that have long
half-life
and are found in appreciable quantity in the
Earth's crust
, along with the
decay product
uranium-234
. The
relative atomic mass
of
natural uranium
is 238.02891(3). Other isotopes such as
uranium-232
have been produced in
breeder reactors
.
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