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Chadwick collided beryllium atoms with alpha particles. From that an unknown radiation was produced. He said this radiation was composed of paticles with neutral electrical charge with the approximate mass of a proton. This particle was named the neutron.

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Moseley attempted to use high positive voltages to transform beta particles (electrons) back into their radioactive source. He created the first atomic battery, or as he called it, the "Radium Battery."
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In 1910 Millikan made the discovery of the charge carried by electrons by conducting the "falling-drop method" experiment. He concluded that the quantity would remain constant for all electrons. Citation

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http://www.electrical4u.com/thomsons-plum-pudding-model/

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JJ Thomson's plum pudding theory of the atom 

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JJ Thomson's plum pudding theory of the atom 

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In 1897 JJ Thomson discovered electron , a negative charge particle more than two thousand times lighter than a hydrogen atom. A sphere shape with positive and negative charges on it.

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Dalton believed that atoms had different size and mass even though they were identical. Dalton's theory was the first complete attempt to describe all matter in terms of atoms and their properties.

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Aristotle was a Greek philosopher and scientist, he rejected Plato's theory

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The Quantum Theory states that it is impossible to locate the exact location of elctrons. It also says that electrons do not move in a definite path/wave, but they can move from energy level to energy level. The electrons with the highest energy are on the outermost levels. An atom is mostly empty space...if the atom was the empire state buidling the nucleus would be the size of a mere grapefruit. (notes)

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Bohr was responsible for discovering the electron. He proposed that eletrons move in an orbit in a similar way that the Earth orbits the sun. He also said that electrons can jump from one energy level to the next, which emits quantum light. Citation

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Rutherford was the scientist to preform the famous gold foil experiment. He used a gun which shot alpha particles to a piece of gold foil only a few atoms thick. Every once in a while the bullet would bounce back, or in different directions, leading to his discovery of the nucleus. He changed the model of the atom to "Rutherford's Model." (notes)

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Democritus is a Greek philosopher, he thought that atoms were small hard and made of the same materials just different. Shapes/sizes and infinite number, always moving and capable of joining together.