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Aristotle did not believe in the Atomic Theory. He believed that everything was made up from ffire, air, earth, and water. this model was adapted in 400 B.C. It
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Thought to have developed the first Atomic theory. Said you could eventually get the the smallest piece of matter
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Discovered Hydrogen and Oxygen. Discpvered the role Oxygen plays in combustion.
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Developed the Atomic Theory.
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Henri Becquerel discovered radioactivity. This produced a charecteristic of elements on the peridoic table.
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Together they discovered Polonium and Radium, Marie coined the term "Radioactivity".
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Planck developed the Quantum Theory.
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Thomson discovered the electron by studying the electric discharge in a high-vacuum cathode-ray tube,
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Discovered the charge of the electron. Used the oil-drop apparatus to measure oil droplets suspended by gravity.
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Studied under Ernest Rutherford. Established Atomic numbers and improved the periodic table.
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Niels Bohr created the Bohr model. It stated that electrons orbit around a nucleus in energy leverls. He perfected Ernest Rutherford's model.
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Rutherford studied inder J.J. Thomson. He conducted the Gold foil experiment in which he transmuted one element into another.
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He discovered the allotropic forms of Hydrogen. It was based on the radiation emitted by an Atom.
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He developed an equation to find the energy level of an atom.
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James Chadwick discovered the Nuetron. He studied under Ernest Rutherford. He also established the atomic number. Added the Nuetron to the Atomic model and theory.
