This model was the first to show a nucleus, consisting of protons and neutrons. Electrons surround the nucleus but are not shown in distinct energy levels.
Planetary model or Rutherford's model
This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive region.
The "Plum Pudding Model" of the atom
Ernest Rutherford discovered that atoms were mostly
Empty space
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