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Evolution of atom

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    • 1. The Evolution of The Atomic Theory
    • 2. Democritus Lived: 460BC-370BC Main concepts: Everything is made of atoms Atoms are indivisible (cannot be divided) Atoms are small and solid particles Named the atom (called it “atomos”)
    • 3. Dalton Lived 1766-1844 Main concepts: Each element has a different atom and a different atomic weight All atoms of the same element are perfectly identical Atoms cannot be created or destroyed in chemical reactions.
    • 4. Thomson Lived: 1856-1940 Main concepts: Discovered that atoms ARE divisible Discovered the electron through his Cathode-Ray experiment Atoms have a much larger mass than electrons Inferred that atoms have a positive charge Plum Pudding Model
    • 5. Rutherford Lived 1871-1937 Discovered that there is a small, dense positively charged nucleus Discovered that most of an atoms mass is in it’s nucleus Predicted the existence of neutrons Stated that electrons move rapidly in the empty space around the nucleus Conducted the gold foil experiment Stated that atoms are mostly empty space.
    • 6. Bohr Lived 1885-1962 Stated that electrons can only travel at specific distances from the nucleus Stated that electrons can jump between levels/paths around the nucleus Stated that the chemical properties of an element are determined by how many electrons are in the outer shell.
    • 7. Chadwick Lived 1891-1974 Discovered the previously unknown part of the nucleus of an atom- the Neutron! Named the neutron because of it’s lack of an electrical charge. His discovery made it possible to create new elements in the laboratory (heavier than Uranium) which was not possible before.
    • 8. Electron Cloud Model This is our most modern and accepted model of the atom It differs from Bohr’s model because it states that the electrons can be found in a general region around the nucleus, not specific paths.
    • 9. Time for: The atom song! http://www.youtube.com/wat ch?v=vUzTQWn-wfE
    • 10. Time for: The atom song! http://www.youtube.com/wat ch?v=vUzTQWn-wfE