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Atomic Theory

Atomic Theory. Cierra Franklin Chemistry September 20, 2011. Democritius. Greek Philosopher 4 th Century Was the first to discover the atom. Concluded that it can’t be broken down. Aristotle and Plato didn’t agree with him. John Dalton. 1766-1844 Formulated the “Atomic Theory”.

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Atomic Theory

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  1. Atomic Theory Cierra Franklin Chemistry September 20, 2011

  2. Democritius • Greek Philosopher • 4th Century • Was the first to discover the atom. • Concluded that it can’t be broken down. • Aristotle and Plato didn’t agree with him.

  3. John Dalton • 1766-1844 • Formulated the “Atomic Theory”

  4. JJ Thomson • 1897 • Discovered the electron (-) while experimenting with cathrode rays. • Estimated weight 1/1840 • Plum Pudding Model

  5. Robert Millikan • 1909 • The “Oil Drop” experiment. • Measured the elementary electric charge (the charge of the electron)

  6. Ernest Rutherford • 1891-1974 • “Goil Foil” Experiment in 1910. • Results: Positively charged nucleus; a small core.

  7. James Chadwick • 1891-1974 • Discovered the neutron in 1932. • The neutron surrounds the nucleus.

  8. Neils Bohr • 1885-1962 • Neils Bohr Model (1913) • Electrons orbit the nucleus in circular paths of fixed energy. • N= energy levels

  9. Quantum Mechanical Model • Deals with subatomic particles as well as atoms, molecules, elements, compounds and much longer systems. • Associated with the quantum theory “matter also has the properties associated with waves.” • Used to explain observations made on complex atoms. • Deals with mathematics.

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