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(442/443) Democritus: The first to start up the research of atoms, he started up the fact that matter was made of small particles he proposed as "atomus".

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(1803) John Dalton: Dalton was one to continue Democritus remains of the theory now called the "atomic theory" starting it by viewing atomus (atoms) as very tiny balls.

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(1904) JJ Thompson: Once again following, Thompson showed that atoms were smaller, his atomic theory adding up, His model was called the "Chocolate Chip Model", the bread evenly out as positive energy and the chocolate chip as the negative.

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(1911) Earnest Rutherford: From JJ's part of the theory, Rutherford then found out about "Protons" and "Nucleus" and instead of having the positive energy all around as shown in the cookie, he stated that the nucleus was all pent upon the center and that the electrons had orbited it mostly are empty space creating the Gold foil theory.

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(1913) Niels Bohr: Bohr had improved Rutherford's theory by arranging the orbit around electrons and the nucleus. He stated that they were circular orbits it was called the "Planetary Model" due to the similarity it had to the solar system.

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(1926) James Chadwick: Chadwick proved the existence of Neutrons. He concieved the atom was understood as a nucleus with protons and neutrons assuming the mass of the 'atom'.