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All matter made is made small particles with different properties.
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All things made of either earth, fire, water, or air.
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Created the Law of Conservation, stating mass cannot be lost or gained.
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All matter is made of atom and all atoms that make up the element have same mass.
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Equal volumes of different gases have the same number of molecules.
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Made table of atomic weights of 43 elements. Discovered Silicon and Selenium.
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Created first Periodic Table of the Elements.
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Discovered electrons with cathode-ray tube, along with Plum Pudding Model stating that protons were inside nucleus of meterial like plum pudding with electrons surrounding.
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Used X-Rays to study atomic structures and found that atomic number equals number of protons in the element.
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Said that atom has an "electron cloud", when electrons were likely to be found, but not always in one spot, surrounding the nucleus.
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Discovered the existence of the neutron in the atom.
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Discovered radioactivity.
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Discovered radium and polonium and made the word Radioactivity
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Created the Quantum Theory by describing glowing matter using quanta.
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Did Gold Foil Experiment, proving the existence of the nucleus of an atom. The forming the Rutherford Model.
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Formed the Planetary Model, which stated that electrons orbit the nucleus like the moon orbits earth. Also that the Periodic Table can predict atomic structure.
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Found the charge of the electron.
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Created the principle of Indeterminacy, stating that position and velocity of a particle is unknown.
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Discovered nuclear fission.
