2_Chapt6_1 - Chapter 6 Structure of the atom What IS the...

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Chem 110 Chapter 6 Chapter 6 Structure of the atom Structure of the atom What IS the structure of an atom? What are the properties of atoms? REMEMBER: structure effects function! Important questions: Where are the electrons? What is the energy of an electron? Chapter 6 Part 1 Duel Nature of Light λν =c E = h ν Photoelectric Effect Line Spectrum Bohr Model of Hydrogen Atom Orbitals Quantum numbers
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Chem 110 Electromagnetic radiation Electromagnetic radiation
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Chem 110 Electromagnetic radiation Electromagnetic radiation c = λν c = 3.00x10 +8 m/s for light What is the range (wavelengths) of visible light? Does uv light have longer or shorter λ than visible? Rank the following ranges of light in order of increasing λ . uv, ir, visible, microwave What is the frequency of light if λ = 450nm? What has a higher frequency? a) visible light ( λ = 640nm) b) microwaves ( λ = 600cm)
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Chem 110 Spectroscopy Spectroscopy Spectroscopy: study of light interacting with matter Light behaves as a wave! Electromagnetic radiation (light) c = λν c = 3.00x10 +8 m/s for light λ = wavelength ν = frequency
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Chem 110 Light behaves as a wave! Light behaves as a wave! Or does it??? Several phenomena were inconsistent with the wave nature of light. Blackbody radiation Photoelectric effect Line spectrum of atoms Black body radiation Planck shows: E= nh ν n= integer ν = frequency of emitted light h= Planck’s constant = 6.626 × 10 -34 J-s Energy = h ν photon frequency of energy photon
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Chem 110 Photon energy Photon energy What is the energy of a green photon (wavelength equal to 523 nm)? 1. 5.74 × 10 +14 J 2. 3.80 × 10 19 J 3. 5.23 × 10 29 J 4. 1.90 × 10 19 J 5. 3.80 × 10 28 J
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Chem 110 Photoelectric effect Photoelectric effect Classically, expect metal to “soak” up energy of light until e binding energy (E b
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2_Chapt6_1 - Chapter 6 Structure of the atom What IS the...

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