Question

How was the presence of neutron in an atom predicted? How were neutrons discovered?

Answer 1

Discovery of neutron:

• The difference in the predicted mass and actual mass of the atom has been found to be equal to the mass of the proton or multiplies the mass of a proton.
• These particles are supposed to have a neutral charge since the atom is electrically neutral they were called neutrons and,
• They were discovered by James Chadwick during an experiment involving the bombardments of the beryllium nucleus with Alpha$\left(\mathrm{\alpha }\right)$ particles.