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Q.
A certain stable nucleide, after absorbing a neutron, emits $\beta$-particle and the new nucleide splits spontaneously into two $\alpha$-particles. The nucleide is
Nuclei
Solution:
After absorbing neutron it undergoes $\beta$ decay.
Also it decays into $2$ alpha particles
Hence, net charge after $\beta$ decay must have been $4$
Before $\beta$ decay it must have been $3$
Since it was stable initially, it must be a common nucleus of $Z=3$ which is ${ }_{3}^{7} Li$