Warm-Up <ul><li>Think of another physical analogy for a “Rutherford” atom other than a stadium. </li></ul><ul><li>Identify...
3-4 Modern Atomic Theory <ul><li>Objectives </li></ul><ul><ul><li>Describe  Bohr’s model of the atom and the evidence for ...
Bohr’s Model of Atoms <ul><li>1913 – Neils Bohr, Danish Scientist </li></ul><ul><li>Planetary model. </li></ul><ul><li>Pos...
Bohr models <ul><li>p +  & n in nucleus </li></ul><ul><li>e -  in energy levels around nucleus </li></ul><ul><li>4 energy ...
Electron Configuration <ul><li>Arrangement of electrons in the orbits of the atom. </li></ul><ul><li>The most stable elect...
Evidence of Bohr’s Model <ul><li>When that light is passed through a prism gives its Spectral signature. </li></ul><ul><li...
Examples of Element Spectrum
 
Bohr's rule for electrons <ul><li>Electrons can only be in &quot;special&quot; orbits.   </li></ul><ul><li>Fill lowest ene...
Bohr Model of Lithium 3 4 e - e - e -
Bohr Model of Argon 18 22 18 Ar 39.948 e -  e - e -   e - e -   e - e -  e - e -  e - e -  e - e -   e - e -   e - e -  e -
Electron Cloud Model <ul><li>Predict the location and speed of the electrons. </li></ul><ul><li>Could not know both. </li>...
Electron Cloud Model
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3 -4 Modern Atomic Theory

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3 -4 Modern Atomic Theory

  1. 1. Warm-Up <ul><li>Think of another physical analogy for a “Rutherford” atom other than a stadium. </li></ul><ul><li>Identify what represents the atom and what represents the nucleus in your analogy. </li></ul><ul><li>How good a match is your analogy for an actual atom? In what ways is it misleading? </li></ul>
  2. 2. 3-4 Modern Atomic Theory <ul><li>Objectives </li></ul><ul><ul><li>Describe Bohr’s model of the atom and the evidence for energy levels. </li></ul></ul><ul><ul><li>Explain how the electron cloud model represents the behavior and locations of electrons in atoms. </li></ul></ul><ul><ul><li>Distinguish the ground state from excited states of an atom based on electron configurations. </li></ul></ul>
  3. 3. Bohr’s Model of Atoms <ul><li>1913 – Neils Bohr, Danish Scientist </li></ul><ul><li>Planetary model. </li></ul><ul><li>Positive & negative attract. </li></ul><ul><li>Specific energy level </li></ul><ul><li>Orbit the nucleus like planets circling the sun. </li></ul>
  4. 4. Bohr models <ul><li>p + & n in nucleus </li></ul><ul><li>e - in energy levels around nucleus </li></ul><ul><li>4 energy levels </li></ul><ul><li>-1 st has up to 2e - </li></ul><ul><li>-2 nd has up to 8e - </li></ul><ul><li>-3 rd has up to 8e - </li></ul><ul><li>-4 th has up to 18e - </li></ul>e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e -
  5. 5. Electron Configuration <ul><li>Arrangement of electrons in the orbits of the atom. </li></ul><ul><li>The most stable electron configuration is when the electrons are in the lowest energy state. </li></ul><ul><li>When electrons are in the lowest energy level, they are said to be in the GROUND STATE . </li></ul>
  6. 6. Evidence of Bohr’s Model <ul><li>When that light is passed through a prism gives its Spectral signature. </li></ul><ul><li>It gives off light unique to that element. </li></ul><ul><ul><li>Kind of like wearing team colors. </li></ul></ul>
  7. 7. Examples of Element Spectrum
  8. 9. Bohr's rule for electrons <ul><li>Electrons can only be in &quot;special&quot; orbits. </li></ul><ul><li>Fill lowest energy orbit. </li></ul>
  9. 10. Bohr Model of Lithium 3 4 e - e - e -
  10. 11. Bohr Model of Argon 18 22 18 Ar 39.948 e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e -
  11. 12. Electron Cloud Model <ul><li>Predict the location and speed of the electrons. </li></ul><ul><li>Could not know both. </li></ul><ul><li>&quot;Cloud&quot; - probable location of electrons </li></ul><ul><li>Propeller blades are a good model of electron cloud. </li></ul><ul><li>Electrons move so fast, like the blades, they are hard to see. </li></ul>
  12. 13. Electron Cloud Model
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