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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
Who discovered the neutron$?$
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Answer

It is remarkable that the neutron was not discovered until $1932$ when James Chadwick used scattering data to calculate the mass of this neutral particle. Since the time of Rutherford it had been known that the atomic mass number $A$ of nuclei is a bit more than twice the atomic number $Z$ for most atoms and that essentially all the mass of the atom is concentrated in the relatively tiny nucleus.

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