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  4. An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide splits spontaneously into two alpha particles. The unknown nuclide is :

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Q. An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide splits spontaneously into two alpha particles. The unknown nuclide is :

Nuclei

Solution:

${ }_{3} Li ^{7}+{ }_{0} n ^{1} \rightarrow { }_{-1} e ^{0} +2_{2} He ^{4}$
Hence the unknown nuclide is ${ }_{3} Li ^{7}$.