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Atomic Theorists

Atomic Theorists

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Atomic Theorists

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  1. Atomic Theorists How we got to where we are now

  2. Law of Conservation of Mass • Matter can’t be created or destroyed • Who: Antoine Lavoisier • When: 1785 • Where: France

  3. Law of Definite Proportions • Compounds = Elements put together in fixed whole number ratios C + O2 CO2 • Who: Joseph Proust • When: 1797 • Where: France

  4. Law of Multiple Proportions • Two elements can form more than one compound • The ratios of elements will be small whole numbers. • Who: John Dalton • Where: England When: 1803

  5. Who: Aristotle What: All matter is a combo of fire, air, earth or water When: 350 B.C. Where: Greece

  6. Who: Democritus • When: 400 B.C. • Where: Greece • What: Matter was made of indivisible substances he called atomos (1st talk of the atom)

  7. Who: John Dalton • What: Solid Sphere Model (1st atomic theory) • Matter is made up of indivisible particles • All atoms of a particular element are identical • Different elements are composed of different kinds of atoms. • Compounds are composed of atoms in specific ratios. • Atoms are not created or destroyed in a reaction. • When: 1805 Where: England

  8. How did Dalton do ? • Matter is made up of indivisible particles No. Atoms can be divided • All atoms of a particular element are identical No. Doesn’t account for isotopes • Different elements are composed of different kinds of atoms. Yes! • Compounds are composed of atoms in specific ratios. Yes! • Atoms are not created or destroyed in a reaction. Yes!

  9. Who: J.J. Thomson • What: Atoms aren't smallest particle • Conducted experiment with a Cathode • Ray Tube • Particles had a negative charge (discovered electrons) • Model = plum pudding When: 1897 Where: England

  10. Cathode Ray Tube

  11. Who: Robert Millikan • What: • Experiments to determine mass of electron • Conducted the oil drop experiment • Verified that electron is negatively charged • No new model • Where: America When: 1910

  12. Millikan Oil Drop Experiment

  13. Who: Ernest Rutherford What: • Conducted Gold Foil experiment • Proved nucleus is dense, positively charged core of atom • When: 1911 • Where: America Model = Planetary Model

  14. Rutherford’s Experiment Gold Foil Experiment

  15. Who: Niels Bohr • What: Pulsating Planetary Model • Electrons can move between energy levels • When: 1913 • Where: Denmark

  16. Who: James Chadwick What: • Confirmed existence of neutron • No new atomic model • When: 1932 • Where: England

  17. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  18. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  19. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  20. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  21. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  22. Whose model of the atom is represented by this diagram? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  23. Whose model of the atom has the name “Planetary Model”? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  24. Whose model of the atom has the name “Solid Sphere”? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  25. Whose model of the atom has the name “Pulsating Planetary Model”? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick

  26. Whose model of the atom has the name “Plum Pudding”? • Aristotle • Democritus • Dalton • Thomson • Millikan • Rutherford • Bohr • Chadwick