write a short note on the DISCOVERY OF NEUTRONS.

Discovery of neutrons: In 1932, James Chadwick bombarded beryllium (Be) with alpha aprticles. He allowed the radiation emitted by beryllium to incident on a paraffin wax. It was found that protons were shot out form the paraffin wax. People began to look for what was in the "beryllium radiations". Some people suggested that the radiations may be gamma radiation. However, Chadwick found that the radiation could not be gamma radiation since energy and momentum were not conserved in its production. He showed that all the observations could be explained if the radiation consisted of neutral particles of mass approximately equal to that of proton. This neutral particle was named neutron.

Diagramatic rrepresentation of experiment: 

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After the discovery of protons and electrons.It was noticed that all the mass of an atom can not be accounted on the basis of protons and electrons present in it.Thus the problem was solved by the discovery of another sub-atomic particle by chewick.In 1932 this particle is called neutron.It is a neutral particle found in the nucleous of an atom. 

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