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In 400 BC Democritus founded the ancient atomist theory. He did no experiments. His model of the atom depended on analogies
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Father of modern chemistry. Named oxygen, hydrogen, and silicon, first to state law of conservation of mass.
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A chemist, meterologist and physicist pioneered the modern atomic theory and research in Colour blindness
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States mass is neither created nor destroyed. And matter remains constant over time.
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Created a scientific theory based off of Democritus atom idea that all elements are created from indestructable particles called atoms. His theory introduced compounds also, when different elements are joined chemical reactions occur.
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Created Periodic Table of Elements and extended it throughout time.
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Discovered electrons by showing that cathode-rays could be deflected electrically. Also discovered Isotopes
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Made the plum pudding model and stated that the charge of an electron is negative.
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Discovered Protons. Concluded that the nucleus is made of protons.
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Developed model of Atom with nucleus in center and electrons orbiting it. Won Nobel Prize in Physics.
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Developed results in the Quantum Theory which formed basis of wave mechanics.
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Sorted elements in periodic table which is still accepted today. Also adavanced the concept of the atomic number.
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Discovered the neutron and that it has no charge and is in the nucleus.
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His discoveries used the falling drop method which balanced downward gravational pull with buoyant and electrical qpward forces between electrons.
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Showed atom was made up of empty space with electrons flowing and a positive charged nucleus in the middle.
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Model that proved the plum pudding model wrong and the model contained a nucleus.
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Depicts the atom as a small positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
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Showed that the atom was made of empty space were electrons moved with a nucleus in the center with postive particles. And that the electrons orbit the nucleus.
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An atom model where electrons are no longer depicted as particles moving around the nucleus in a fixed orbit and showed exactly were the paricles are.
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Showed behavior of particles in the atomic realms and diagramed the electron clouds.
