2_Lecture BOHR_1

2_Lecture BOHR_1 - Structure of the Atom Part I(continued...

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Mary J. Bojan Chem 110 1 Structure of the Atom – Part I (continued) What IS the structure of an atom? What are the properties of atoms? REMEMBER: structure affects function! Important questions: Where are the electrons? What is the energy of an electron? Dual Nature of Light λν =c E = h ν Line Spectrum Bohr Model of Hydrogen Atom
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Mary J. Bojan Chem 110 2 Quantized Energy Energy comes in discrete packets, or “ quanta Energy of a quantum ε is ε = h ν ν = frequency of light h = Planck’s constant = 6.63 × 10 -34 J · s Total energy in light beam is n h ν (n = 1, 2, 3, ) Dual Nature of Light Wave λν = c Particle E = h ν Experimental support: • black-body radiation (Planck, 1900) • photoelectric effect (Einstein, 1905) • line spectra of hydrogen (Bohr, 1913)
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Mary J. Bojan Chem 110 3 Line Spectra of Atoms Spectroscopy : study of light interacting with matter Spectrum : distribution of ν in emitted radiation
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Mary J. Bojan Chem 110 4 Line Spectra of Atoms Spectrum Type ν s Examples Monochromatic Continuous Discrete (or line) DEMONSTRATIONS: How can we explain all of this? Hydrogen
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Mary J. Bojan Line spectra of atoms Observation of line spectra implies that atoms have discrete (quantized) energy levels. Ground state (E 1 ) Excited state (E 2 ) Excited state (E 3 ) absorption Δ E = h ν emission Δ E = h ν 5 Chem 110
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Mary J. Bojan Bohr Model of H atom (1913) H atom has 1 proton (+) and 1 electron ( – ) . Where is the proton? Where is the electron? Bohr proposes that the electron is in one of several possible “orbits” around the proton. 6 Chem 110
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Mary J. Bojan Bohr Model of H atom (1913) n = 1, 2, 3, .. principal quantum number R H = Rydberg constant = 2.18x10 –18 J Ο Π Ξ Μ Ν Λ = 2 1 n R E H n 7 Chem 110 If the electron is in an “orbit”, what is it’s energy?
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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2_Lecture BOHR_1 - Structure of the Atom Part I(continued...

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