JJ Thomson, James Chadwick, Ernest Rutherford, John Dalton, Robert Millikan….how do they compare? i know that JJ Thomson discovered the electron and made a model of the atom the so called ”plumcake” model vere the electrons were scattered in a body of positive electricity. And, explained difficulties with atomic weight of atoms. had been prisoned in germany for four years, then to return home to cambridge, where he had worked with his rutherford… James Chadwick discovered the neutron explaining some difficulties vith atomi weight of atoms. Ernest Rutherford explained several matters about radioactivity and the general arrangement of nucleus and electrons.

anything else? and millikan?