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Democritus was a Greek philosopher and believed the world was made of empty space and tiny bits of "stuff". He called them atoms, the Greek word for atomos meaning cannot be divided.

- 370 B.C)

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John Dalton was an English Chemist and schoolteacher. He thought that atoms made up matter and could not be seen with the naked eye. Also, he thought that each element was made of only 1 atom.

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John Dalton created the Billiard Ball model in 1808. He thought they were small, hard, and hollow spheres.

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Dmitri Mendeleev was a Russian Chemist and created the framework for the modern periodic table. He fit the atoms in to groups and put them in order based on their atomic weight.

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J.J. Thomson was an English Chemist that discovered the presence of negatively charges particles in atoms called electrons. He proved this by using a Cathode ray tube and created an atomic model known as the "plum pudding" model.

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These 2 French Physicist found 2 very radioactive elements, polonium and radium. Marie created the term "radioactivity" for the release of spontaneous ionizing rays.

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Created by J.J. Thomson after the discovery of the electron, which had the electrons in a positively charged fluid.

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Rutherford discovered that each atom had a center, called the nucleus, that was positively charged. He found that the electrons were in mostly empty space and were orbiting the nucleus.

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In Millikan's experiment with drops of oil he found that electrons have a fundamental electric charge. This means that each electron has a charge that is a multiple of a single number.

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Bohr thought that the electrons moved in a circular path around the nucleus at different energy levels. This would go on to help scientist predict chemical properties of elements.

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Created by Niels Bohr, the atom was believed to be like a solar system. The electrons would orbit around the nucleus.

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Chadwick was a student of Rutherford's and continued to study atoms. He found that the nucleus had uncharged particles inside, and called these neutrons.

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The current atomic model is the electron cloud model. It has the nucleus in the center made of protons in neutrons. Sine the electrons move so fast, there is a cloud where they are located.