It is actually a subatomic particle, which is having a neutral charge.
The symbol of neutron is .
It is basically a particle which is of about the same mass as that of a proton and there will not be any electric charge.
And it was discovered by James Chadwick in the experiment of the bombardment of the Beryllium with the alpha particles with the use of natural radioactive decay of the Polonium element.
Therefore, Neutron was discovered by James Chadwick in the year 1932.