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Democritus proposed the first atom theory. He called them atomos
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A more well know philosopher Leucippus said that Democritus theory wasn’t correct and that things were actually made of earth water air and fire.
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He proposed the atomic theory where everything is made of smaller things.
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He started the gold foil experiment with alpha particles which he discovered. The thought was that a atom was a solid thing but they found out it was mostly empty space. Also something in the middle cause the positive alpha particles to be repealed which is now called the nucleus.
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He came up with the first picture of what a atom could look like which was called the orbital model.
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He came up with the wave model of the atom.
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Using alpha particles he discovered a neutral atomic particle with a mass close to a proton. This was the neutron.
