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There was only four elements that existed. Those elements were fire water air and earth. All matter was composed of these four elements. All elements and matter only had four characteristics as well. The characteristics included hot,cold,dry and wet.
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Democritus was a Greek philosopher. Democritus believed that ALL matter was made up of atoms. Atoms were the simplest part of matter. Democritus came up with the word "atom" through the Greek word "atoms" meaning indivisible or indestructible.
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A.L was a French nobleman and chemist. He was known as the "Father of Modern Chemistry". A.L noticed,discovered,and named "Oxygen".
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John Dalton was an English Chemist and school teacher. He created "Dalton's Atomic Theory." This theory contains evidence that all matter is composed of atoms. Which John Dalton believed were indivisible.
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William was a British physical chemist. Crooks discovered Thallium.
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Marie and Pierre Curie (husband and wife) discovered and isolated Radium and Polonium.
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German theoretical physicist, he discovered the "Planck constant". A physical constant that is quantum of action in quantum mechanics. (E=hr)
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Rutherford was a physicist from New Zealand. He found that an atom has a small dense and positively charged nuclear. Also, that electrons move around that nuclear.
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Bohr was a Danish physicist. He made the Bohr atomic model that showed electrons move in a circular orbit at fixed distances from the nucleus.
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Millikan was an American physicist. He discovered the charge and mass of an electron by using a single oil drop.
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Schrödinger was an Austrian physicist that developed mathematical equation to describe the motion of electrons in atoms. It lead to the electron cloud model.
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Geiger was a German nuclear physicist that invented the Geiger Counter to measure radiation with Ernest Rutherford.
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English physicist discovered the neutron which has no/equal charge
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She was an Austrian physicist who worked on radioactivity and nuclear physics. Along with Otto Hahn and Fritz Strassman became the first to recognize that the Uranium atom when bombarded by neutrons actually split. This is known as nuclear fission.
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He was a nuclear chemist from the United States. He discovered Plutonium.
