<P> The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle , distinct from the proton . </P>
<P> The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle , distinct from the proton . </P>
who provided evidence to suggest the existence of the neutron
who provided evidence to suggest the existence of the neutron
James Chadwick
James Chadwick