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In 1936 Austria, Schrodinger added onto the Bohr model. He used mathematical equations to find the likelihood to find an electron in a certain position (Quantum Mechanical Model).

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In 1913 Denmark, Bohr discovered that atoms had orbitals hat electrons traveled in and that the electrons in the outer shell determined the properties of an element.

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In 1911, U.K., Rutherford was the first to discover that atoms had a largely empty space in between the nucleus and electrons.

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In 1897, UK, Thomson discovered subatomic particles (electrons and the nucleus).

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In 1911, Russia, Mendeleev drafted the first periodic table

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In 1803 U.K., Dalton added onto Democritus's theory. He also stated that compounds were arrangements of small particles in a fixed ratio. He also proposed that chemical reactions resulted in the rearrangement of particles.

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In 400 B.C. Greece, Democritus came up with the theory that all matter is made up of small particles called atoms. Each different material had a different shape of what he called atomos. They were circular in shape.