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John Daltons Atomic Theory

John Daltons Atomic Theory. All matter is composed of small particles called atoms All atoms of a given element are a like Compounds are formed when different atoms combine in fixed proportions A chemical reaction involves the rearrangement of atoms. Development of the Atom.

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John Daltons Atomic Theory

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  1. John Daltons Atomic Theory • All matter is composed of small particles called atoms • All atoms of a given element are a like • Compounds are formed when different atoms combine in fixed proportions • A chemical reaction involves the rearrangement of atoms

  2. Development of the Atom • John Dalton - Produced the first atomic theory Taught that atoms were hard round spheres

  3. Development of the Atom • John Dalton (1803) - Produced the first atomic theory Taught that atoms were hard round spheres • Michael Faraday (1825)- Split compounds by electrolysis and showed that atoms have electrical properties

  4. Ions - Charged atomsCation - positive charged atomAnion - negative charged atom

  5. Development of the Atom • John Dalton - Produced the first atomic theory Taught that atoms were hard round spheres • Michael Faraday - Split compounds by electrolysis and showed that atoms have electrical properties • Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ration on the electron

  6. Development of the Atom • John Dalton - Produced the first atomic theory Taught that atoms were hard round spheres • Michael Faraday - Split compounds by electrolysis and showed that atoms have electrical properties • Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ratio on the electron • Eugene Goldstein - Discovered the proton. Found mass to be 1837 time the electron and + charged

  7. Development of the Atom • Joseph John Thompson - Used cathode ray tube to discover the negative charged electron and the mass to charge ratio on the electron • Eugene Goldstein - Discovered the proton. Found mass to be 1837 time the electron and + charged • Robert Millkan - Determined the electron charge, using oil drop experiment

  8. Development of the Atom • Eugene Goldstein - Discovered the proton. Found mass to be 1837 time the electron and + charged • Robert Millkan - Determined the electron charge • Dmitri Mendeleev - Father of the periodic table – predicted that his unfilled table represented undiscovered elements

  9. Other Contributors • Wilhelm (Conrad) Roentgen – X-Ray’s • Henri Becquerel – Radioactivity • Marie Curi – Intensity of Radioactivity

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