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 number of mass.

Answer 2

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 number of mass

I hope you can understand

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