Question

In nuclear reaction ${}_{4}B{e}^9{+}_{2}H{e}^4{\to }_6{c}^{12}$+X, X will be :

• A. Proton
• B. Neutron
• C. $\beta$ -particle
• D. $\alpha$ -particle

Answer 1

The correct option is B Neutron

${}_{4}B{e}^9{+}_{2}H{e}^4{\to }_6{C}^{12}+X$

No. of protons are already balanced with $C$.
$\therefore$ $X$ carries no charge.
and $9+4>12$ by $1$ unit mass.
$\therefore$ $X$ carries one unit mass.
It's a neutron.