RUTHERFORD ATOM
\ɹˈuːðəfəd ˈatəm], \ɹˈuːðəfəd ˈatəm], \ɹ_ˈuː_ð_ə_f_ə_d ˈa_t_ə_m]\
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first modern concept of atomic structure; all of the positive charge and most of the mass of the atom are contained in a compact nucleus; a number of electrons (equal to the atomic number) occupy the rest of the volume of the atom and neutralize the positive charge
By Princeton University