Question

${}_1^{2}H{+}_1^{2}H\to {}_2^{3}He+X$
From the above nuclear fusion reaction, Identify the particle $X$.

• A. Positron
• B. Electron
• C. Proton
• D. Neutron
• E. Alpha particle

Answer 1

Answer: (D)

Neutron

Let $A$ be the mass number of X and Z be the atomic number of it.

From mass number conservation, $2+2=3+A$ or $A=1$

From atomic number conservation, $1+1=2+Z$ or $Z=0$

$Z=0$ means neutral so X will be neutron.