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Antoine-Laurent Lavoisier wrote the first modern chemistry book stating one of his theories; the law of conservation of mass.
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John Dalton's Atomic Theory stated that all matter is composed of atoms, which are small and indvisible.
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The first actual publication of a periodic table of elements was by Dmitri Mendeleev.
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Eugene Goldstein discovered positive particles with equal and oppsite charges to the electron.
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Wilhelm Conrad Röntgen discovered the x'ray accidentall when researching the glow produced by cathode rays.
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Using a cathode ray tube Thomson discovered negatively charged particles which were the universal building block of all atoms called electrons.
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The Bohr model explains the theory that electrons travel in orbits around the atom's nucleus.
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Rutherford conducted exeriments with radioactive alpha particles. He concluded that atoms constisted of a small, dense core of positively charged particles called a nucleus.
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James Chadwick discovered a new particle in the atomic nucleus with no charge naming it the neutron.
