Plum pudding model, electrons spread out the whole atom, positive charge spread out, positive charge weak, mass spread out, , Rutherford Nuclear model, electrons orbiting the nucleus, positive charge concentrated in nucleus, mass concentrated in the nucleus, atom mostly empty space, mass concentrated in a tiny nucleus, , The model we use today, Electrons on energy levels, atoms mostly empty space, protons and neutrons in the nucleus, most mass in the nucleus, .

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