Lect 7 Quantum Theory-2010

Lect 7 Quantum Theory-2010 - Quantum Theory of the Atom...

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Unformatted text preview: Quantum Theory of the Atom Radiant Energy Matter Rutherford model for atomic structure based on Newtonian Mechanics was unstable A new set of laws were needed to explain atomic structure based on quantum theory Wave Mechanics Bohr Atom, 1913, Niels Bohr Bohr Atom = Rutherford model + Quantum Theory Quantum Theory concerned with the nature of radiant energy and how it is emitted and absorbed by matter. c = m s = wave s m wave x Electromagnetic Spectrum Excited Matter radiates energy Lithium Flame Sodium Flame Emission (line) Spectra Emission (line) Spectra Line Spectra Balmer, 1855 H n = 3 656.3 nm (red) n = 4 486.1 nm (blue-green) n = 5 434.0 nm (blue) n =6 410.1 nm (indigo) - = 2 2 n 1 2 1 R 1 R = Rydberg constant (1.097 x 10-2 nm-1 ) Empirical relation Quantum Theory, Max Planck, 1910 Black body radiation Photoelectric effect Vibrating hot objects only vibrate with certain frequencies Energy is not emitted continuously but is given off in discrete packets of energy called quanta....
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Lect 7 Quantum Theory-2010 - Quantum Theory of the Atom...

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