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chapter+6+and+7 - 1 Electromagnetic Spectrum 2...

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1 Electromagnetic Spectrum 2 Electromagnetic Spectrum 3 Line Spectrum

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4 Plank’s Constant E=h ν =hc/ λ where h=Plank’s Constant, c=speed of light in a vacuum, ν =frequency, λ =wave length, and E=energy of a quantum (photon) 5 Calculating Frequency from Wavelength Sodium emits yellow light at wavelength 589 nm. What is the frequency of this light and what is energy of one photon? C = 3.00 x 10 8 m/s h = 6.626 x 10 -34 J-s 6 Bohr’s Model Electrons in orbits about nucleus Energy is absorbed when electron moves to orbit away from nucleus Energy is emitted when electron falls back towards nucleus Ground state Excited state
7 Bohr’s Atom 8 Bohr’s Model Replaced De Broglie - matter waves Heisenberg - Uncertainty Principle Schrodinger - wave mechanics Wave functions, ψ Quantum numbers Probability density, ψ 2 orbitals 9 Orbitals, Shells, Quantum Numbers Orbital is not an orbit Region in space about nucleus

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chapter+6+and+7 - 1 Electromagnetic Spectrum 2...

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