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Democritus introduced idea of matter as basic building block matter.

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Aristotle disagreed with atomic theory, believed everything was made of 4 elements: earth, air, water, fire.

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proposed that every single atom of an element is the same as every other atom of that element.

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theory that matter is composed of particles called atoms.

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a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface.

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Discovered by searching cathode rays for carrier of electrical properties in matter.

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Discovered the electron.

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Model of atom known as Plum Pudding Model.

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Discovered nuclear structure of atom, discovered alpha and beta rays, proposed laws of radioactive activity.

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discovered by Ernest Rutherford.

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proposed that the negatively charged electrons surround the nucleus of an atom.

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A beam of alpha particles was aimed at a piece of gold foil. Most alpha particles passed through the foil, but a few were scattered backward. This showed that most of the atom is empty space surrounding a tiny nucleus.

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Known for his work on the structure of atoms.

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In this model, the electrons travel around the nucleus of an atom in distinct circular orbits

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Discovered by Ernest Rutherford in 1917.

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specifies the probability of finding an electron in the three-dimensional space around the nucleus.

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Proved the existence of neutrons.

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Discovered by James Chadwick.