Question

A certain stable nucleide, after absorbing a neutron, emits $\beta$ -particle and the new nuclide splits spontaneously into two $\alpha$-particles. The nucleide is

• A. ${}_2^{4}He$
• B. ${}_3^{7}X$
• C. ${}_4^{6}Be$
• D. ${}_3^{6}Li$

Answer 1

The correct option is B ${}_3^{7}X$

$\begin{array}{c}{}_Z^{A}X+{}_0^{1}x\to 2{}_2^4\alpha +{}_{-1}^0\beta \\ \therefore Z+0=4-1=3\\ A+1=8\\ \therefore {}_3^{7}X\\ Ans.\left(B\right)\end{array}$