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

Atomic structure

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