What is the particle X in the fusion reaction shown below?

${ }_1^2 H+{ }_1^2 H \rightarrow{ }_2^3 He+X+3.27 MeV$

a neutron

The correct answer is Option (3) → a neutron

${ }_1^2 H+{ }_1^2 H \rightarrow{ }_2^3 He+X+3.27 MeV$

∴ This reaction is called Nuclear fission wherein two atoms combine to make a heavier element releasing energy and neutrons.

This process occurs because the total mass of the resulting nucleus is less than the mass of original nuclei.