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Atoms

Atoms. Mr. Skirbst Physical Science Topic 13. Atomic Models. Atomic Models. Democritus – Ancient Greek Philosopher - “ atomos ” - indivisible. Atomic Models. 2. John Dalton – 1803, Eng. Chemist Atomic Theory Of Matter (ATOM):

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Atoms

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  1. Atoms Mr. Skirbst Physical Science Topic 13

  2. Atomic Models

  3. Atomic Models • Democritus – Ancient Greek Philosopher - “atomos” - indivisible

  4. Atomic Models 2. John Dalton – 1803, Eng. Chemist Atomic Theory Of Matter (ATOM): * All elements made of indivisible atoms * Atoms of an element are alike * Different elements have different atoms * Atoms join to form compounds

  5. Atomic Models 3. J.J. Thomson - 1897, Eng. Scientist Plum Pudding Model: * Atoms made of (+) “pudding” * (-) “corpuscles” scattered throughout

  6. Atomic Models • Ernest Rutherford - 1908, Eng. Physicist “Gold Foil” Experiment: * Atoms have dense, central nucleus * Nucleus has (+) particles * (-) particles outside nucleus (electrons)

  7. Atomic Models 5. Niels Bohr - 1913, Danish Physicist Electron-Orbital Model: Electrons move in definite “orbits” around nucleus in energy levels

  8. Atomic Models 6. Wave Model - today, many Electron Cloud: *Electrons found in “electron cloud” around nucleus * Both ENERGY and POSITION of electron CANNOT be known at same time

  9. Atomic Structure Sub-Atomic Particles * Parts smaller than the atom itself PROTON – (+) charge, in nucleus NEUTRON – (0) charge, in nucleus ELECTRON – (-) charge, around nucleus

  10. Atomic Structure ATOMIC NUMBER = the # of protons ATOMIC MASS = # protons + # neutrons ISOTOPE – atom with different # neutrons QUARKS – particles that make up sub-atomic particles

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