Physics - Modern Physics Question with Solution | TestHub

$Y\left(\mathit{n}\mathit{,}\mathit{ }\mathit{\alpha }\right)$means the nucleus splits into$\alpha$-particle and neutrons

i.e.,${\mathrm{ }}_{\mathrm{Z}}{\mathrm{Y}}^{\mathrm{A}}+{\mathrm{ }}_0{\mathrm{n}}^1\to {\mathrm{ }}_3{\mathrm{Li}}^7+{\mathrm{ }}_2{\mathrm{He}}^4$

So,$A+1=7+4$

$\Rightarrow A=10$

and$Z+0=3+2$

$Z=5$

Hence, the nucleus of elements$Y$is boron

i.e.,${\mathrm{ }}_5{\mathrm{Y}}^{10}={\mathrm{ }}_5{\mathrm{B}}^{10}$