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Atomic Theory

Atomic Theory. Throughout history man has attempted to explain the nature of matter. Democritus, an early Greek, proposed that matter was composed of tiny indivisible particles called atoms, meaning indivisible. It was not until 1807 that the atomic theory was thoroughly revised by John Dalton.

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Atomic Theory

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  1. Atomic Theory

  2. Throughout history man has attempted to explain the nature of matter.

  3. Democritus, an early Greek, proposed that matter was composed of tiny indivisible particles called atoms, meaning indivisible.

  4. It was not until 1807 that the atomic theory was thoroughly revised by John Dalton.

  5. Dalton’s theory stated • All matter is made up of tiny particles called atoms that cannot be split into smaller particles (wrong). • Atoms cannot be created or destroyed • All atoms of the same element have the same properties and atoms of different elements have different properties. • Atoms of different elements can combine to form new substances.

  6. His ideas marked the beginning of the modern atomic theory.

  7. The work of later scientists such as JJ Thomson, Lord Rutherford and Neils Bohr established a workable model of the atom. Thomson Rutherford Bohr

  8. Dalton stated that the atom is a hard, dense sphere.

  9. Thomson in 1903 stated that the atom is a mass of positive charge and contained negative electrons. p+ e- e- p+ e- e- e- p+ p+ e- p+ e- e- p+ e- p+ p+ e- e- e- p+ e- p+

  10. Rutherford’s Model in 1911 described the atom as having a dense nucleus surrounded by electrons. e- e- e- e- e- e- e- e- e-

  11. Bohr developed a model in 1913 that had a dense nucleus and electrons that move in fixed orbits (shells) around the nucleus in a “cloud” of activity

  12. http://micro.magnet.fsu.edu/electromag/java/rutherford/http://particleadventure.orghttp://micro.magnet.fsu.edu/electromag/java/rutherford/http://particleadventure.org

  13. James Chadwick (1885 - 1962) developed a new model of the atom in 1932. Similar in many ways to other models, his showed the nucleus made up of particles called neutrons.

  14. 10,000,000 atoms placed side by side would measure only 1 cm.

  15. The particles inside atoms are called subatomic particles. In the middle of every atom is its nucleus.

  16. The nucleus is made of the proton and neutron. A third type of subatomic particle spins around the nucleus, it is called the electron.

  17. Proton Neutron Electron

  18. Proton Neutron Electron

  19. Proton Neutron Electron

  20. Proton Neutron Electron

  21. Proton Neutron Electron

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  23. Proton Neutron Electron

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  27. Proton Neutron Electron

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  30. Proton Neutron Electron

  31. Proton Neutron Electron

  32. Proton Neutron Electron

  33. Proton Neutron Electron

  34. Proton Neutron Electron

  35. Proton Neutron Electron

  36. Proton Neutron Electron

  37. Proton Neutron Electron

  38. Proton Neutron Electron

  39. Proton Neutron Electron

  40. Proton Neutron Electron

  41. Proton Neutron Electron

  42. Proton Neutron Electron

  43. Proton Neutron Electron

  44. Proton Neutron Electron

  45. The electron is by far the smallest of these subatomic particles. Their mass is only 1/1840th the mass of a proton.

  46. Even though protons are much larger than electrons, they both have the same amount of electrical charge.

  47. Protons have a positive charge (+).Electrons have a negative charge (-).Neutrons have no charge (0).

  48. Particles with opposite electrical charges are attracted to each other, in the same way that magnets with opposite poles stick together.

  49. Got a problem, ask a chemist, they have solutions.

  50. A small piece of sodium which lived in a test tube fell in love with a bunsen burner. “Oh bunsen, my flame, I melt whenever I see you” the sodium said.“It’s just a phase you’re going through” replied the Bunsen burner.

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