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Democritus contributed to the atomic theory from 460-370 BCE in Greece. He said that all matter is made up of atoms which are small particles that are invisible.

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Dalton contributed to the atomic theory in 1803 in Great Britain. He said that all matter is made up of different sized atoms and atoms with a different mass. He also said that atoms in a gas repel each other and in other scenarios, they react differently.

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Mendeleev contributed to the atomic theory in 1871 Russia. He modeled the periodic table of elements and added information about the elements' atomic weight and mass.

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JJ Thompson contributed to the atomic theory in 1897 England. He discovered that the electron and also positively and negatively charged particles in the atom.

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Ernest Rutherford was from New Zealand but also studied in England. He contributed to the atomic theory in 1911. He discovered that the nucleus of the atom was charged and was surrounded by empty space with electrons circling it.

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Bohr contributed to the atomic theory in 1913 in Denmark. He studied the hydrogen atom based on the quantum theory. He added that electrons only orbit the nucleus in uncertain ways.

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Schrodinger contributed to the atomic theory in 1926 Austria. He contributed to the quantum mechanical model of the atom.