Plum pudding model
The
Plum pudding model of the atom was made after the discovery of the
electron but before the discovery of the
proton or
neutron. In it, the atom is envisioned as electrons surrounded by a soup of positive charge, like plums surrounded by
pudding. This model was disproved by an experiment by
Ernest Rutherford when he discovered the nucleus of the atom.
See also: Rutherford scattering, atom