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Q.
The abundant ${ }_{92}^{238} U$ isotope is non-fissionable but produces which radioactive element when captures neutron
Nuclei
Solution:
The abundant ${ }_{92}^{238} U$ isotope, which does not fission, on capturing a neutron leads to the formation of plutonium. The series of reactions involved is
${ }_{92}^{238} U +n \rightarrow{ }_{92}^{239} U \rightarrow{ }_{93}^{239} Np +e^{-}+\bar{v}$
${ }_{93}^{239} Np \rightarrow{ }_{94}^{239} Pu +e^{-}+\bar{v}$
Plutonium is highly radioactive and can also undergo fission under bombardment by slow neutrons.