Answer
$_{83}^{235}Bi$
Work Step by Step
Bi-235 reacts with a neutron to form Tc-137, Zr-97 and 2 neutrons.
$_{83}^{235}Bi + _{0}^{1}n → 2 \space _{0}^{1}n + _{43}^{137}Tc + _{40}^{97}Zr$
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