Question

State the problem of atomic structure which was solved after the discovery of neutron?

Answer 1

The problem was that the time when the neutron was not discovered, many scientists found that the atomic mass of many atoms was found to be double or more than double, the mass of total no. of protons (as the mass of electron was so small that it was assumed to be negligible, so by the discovery of neutron led to the solution of this problem.
For e.g.- The mass of carbon12 atom is 12 u but the no. of protons were 6, so it becomes 6 u, which is not correct.

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