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Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
Atomic spectrum
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Atomic spectrum

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Transcript

  • 1. Atomic Spectrum March 25, 2013
  • 2. Objectives 1. 2. 3. Explain why scientists know the identity of the chemical compositions of stars Describe a flame test Distinguish between absorption and emission
  • 3.  Atoms can absorb and release energy  When atoms release energy they emit light  Each atom emits only a certain frequency of light
  • 4. Shell Model   Electrons can jump between shells when excited When they jump back down they release that energy as light
  • 5. Na Li B Cu Ca
  • 6. Spectroscope  White light separates into its color components by a prism  Each color corresponds to a different frequency of electromagnetic radiation
  • 7. Spectroscope
  • 8. Spectroscope  Observe color components of any light source
  • 9. Atomic Spectrum  Light from atoms consist of a number of discrete frequencies rather than a continuous spectrum  Pattern of frequencies of a particular element – atomic spectrum
  • 10.  Atomic spectrum – atoms “finger print”  Emission – the frequencies the gas emitts Absorption – frequencies of all white light EXCEPT those that are absorbed by the gas 
  • 11. •  Emission  Absorption
  • 12.  http://jersey.uoregon.edu/vlab/elements/Elemen
  • 13.  http://video.google.com/videoplay?docid=25558

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