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class11 - and 750 nm Atomic energy levels usually get...

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Class #11 Atomic Spectra and Energy Levels CHEM 107 A. Bengali Texas A&M University Qatar
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Atomic Spectra ) Excited atoms emit light (neon signs, etc.) ) Emission from different elements is different colors. ) Emission of only certain wavelengths ) “Spectral lines”
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H 2 Emission H
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Helium Emission He
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Energy Levels ) Existence of spectral lines is evidence of “quantized energy levels .”
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Atomic Spectra: Emission Δ E (atom) = E (photon) = h ν + h ν Excited Atom De-excited Atom + Photon
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Atomic Spectra: Absorption Δ E (atom) = E (photon) = h ν + h ν Atom + Photon Excited Atom
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Problem - Energy Levels ) A hypothetical atom has only 4 energy levels. ) Emission spectrum shows 6 lines at wavelengths of 100, 120, 150, 300, 500,
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Unformatted text preview: and 750 nm. ) Atomic energy levels usually get closer together as energy increases. Problem - Energy Levels ) Draw an energy level diagram for this atom ) Label the states by energies: E 1 < E 2 < E 3 < E 4 ) Use arrows to show the 6 transitions, and assign the correct wavelengths ) Try to draw “to scale” 4 Energy Levels E 4 E 3 E 2 E 1 E 6 Transitions E 4 E 3 E 2 E E Energies ) 100 nm: 1.99x10 –18 J ) 120 nm: 1.66x10 –18 J ) 150 nm: 1.33x10 –18 J ) 300 nm: 6.63x10 –19 J ) 500 nm: 3.98x10 –19 J ) 750 nm: 2.65x10 –19 J Emission Wavelengths E 4 E 3 E 2 E 1 E 750 300 500 150 120 100...
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class11 - and 750 nm Atomic energy levels usually get...

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