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- Democritus was the first to discover atoms.
- Democritus  said that atoms were indivisible.

- Democritus said that  atoms cant be cut.
- This was around 400B.C

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- Aristotle said that atoms  were made of Fire, Water, Air, Earth and wind.
- This was around 300 B.C.
- Aristotle had more people listening to hem then Democritus but Democritus theory was more important then Aristotle.

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- Dalton theory  was made in 1804.
-  Dalton said that Atoms of different elements combine to make compounds.
-  Dalton said that all atoms of the same element were the same.
- Dalton said that atoms of different elements were different.

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- Thomson said in 1897  that atoms had small  particle.
- Thomson came up with the idea that positive and negative have a equal charge.
- Thomson said that theirs charged particles inside an atom called electrons.

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- Rutherford discovered the center of a atom that is called the Nucleus.
-  Rutherford said that atoms are mostly empty space.
- His theory was made in 1911.

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- Bohr  discovered the Planetary Atomic Model.
- Bohr theory was made in 1913
- Electrons travel in paths called energy levels.
- The location of an electron depends on how much energy it has.

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- Chadwick discovered was on Neutrons.
-  Chadwick said that the Nucleus was made of Protons and Neutrons.
- His theory was made in 1932.

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- Schrodinger, Heisenberg and Einstein discovered that electrons  travel in ever changing path.
-  They have  a different path every time.
-  They also  discovered that electron clouds.
- This theory was made in 1925.