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In 400BC Democritus came up with the concept of the atom. Which he based his theory on observations and natural curiosity.
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He made his mind up that there is many different kinds of atoms. He based his theory by spending a lot of time in labs and watching reactions.
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That atoms have positive and negative charges and that they can be divided, He based his theory on using a cathode ray. Called his atom model " Plum Pudding".
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He discovered that atoms had a nucleus and discovered that there was protons. He shot high velocity alpha particles to spread out the atom. Used the beam to go through a gold plate.
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He said that electrons orbited around the nucleus. He did work on Rutherfords model and came up with several different theories. He thought the particles orbited in a neat rotation.
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Both said that electrons did not orbit the nulceus in complete neat orbit. He said they were in a very unpredictable manor and didn't go in a complete circle. He worked closely on theoretical investigations into the quantim theory.
