Question

When boron nucleus ${(}_5^{10}\text{B})$ is bombarded by the neutrons, $\alpha$-particles are emitted. The resulting nucleus is of the element ............... and has the mass number ...............
1. Li, 6
2. Li, 7
3. Be, 8
4. Be, 9

Answer 1

When boron nucleus ${(}_5^{10}\text{B})$ is bombarded by the neutrons, $\alpha$-particles are emitted. The resulting nucleus is of the element Li and has the mass number 7
${}_5^{10}\text{B}{+}_0^{1}n{\to }_2^{4}He{+}_3^{7}Li$