The number of neutrons released during the fission reaction
\[
{n} + ^{235} {U} \longrightarrow ^{133} {Sb} + ^{99} {Nb} + {neutrons is}
\]
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The fission of uranium-235 usually results in the release of 4 neutrons per fission event, which is crucial for sustaining the chain reaction in nuclear reactors.
The number of neutrons released during the fission reaction of uranium-235 is typically 4. This is a known value for the fission of uranium isotopes, where a single fission event of uranium-235 generally produces 2 to 3 neutrons, but on average, it is 4 neutrons that are released. These neutrons can go on to initiate further fission reactions, leading to a chain reaction. This process is a fundamental aspect of nuclear reactors and nuclear weapons.