When a boron nucleus (`_5^10B`) is bombarded by a neutron, an `alpha`-particle is emitted. Which nucleus will be formed as a result?

Options

A. `""_1H^2`
B. `""_3Li^7`
C. `""_2Li^8`
D. `""_4Li^7`

Answer

C

Explanation

The reaction is given by `""_5B^10 + ""_0n^1 = ""_2He^4 + ""_ZX^A`
`therefore` For X, Z = 5 - 2 = 3 and
A = (10 + 1 - 4) = mass number
For lithium Z = 3 `therefore` the resulting nucleus is `""_3Li^7` .