atomic structure and periodic properties lecture 2 for posting

Atomic structure - In the previous lecture we talked about the idea that light can be seen to be a wave by double slit experiment demonstrating the

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In the previous lecture we talked about the idea that light can be seen to be a wave by double slit experiment, demonstrating the wave property of interference. We also said that the photoelectric effect showed that light is also a particle, existing as a photon. The energy of the photon is given by E = h . Just as light can be said to act as either a wave and a particle, depending on the experiment you do, the same is true of particles like electrons or neutrons. Electrons and neutrons, just like light photons, exhibit interference in a two slit experiment.
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7–2 Animation about double slit experiment This apparent link between observation and reality was the topic of intense debate: Schrodinger’s Famous Cat Again the cat, to be, or not to be?
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LINE SPECTRA Electronic Transitions in the Bohr Model for the Hydrogen Atom E n = -(2.178x10 -18 J)Z 2 /n 2 Note: the energy of the n = ∞ energy level is zero (an ionized electron)
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CORE IDEA: If an electron moves from a higher energy orbit to a lower energy orbit, that energy is emitted as a photon with an energy (E=h ν ) that exactly equals the change in electron potential energy. If an electron collides with a photon of an energy (E=h ν ) that exactly equals the difference in energy between two orbitals, the electron absorbs the photon and moves to the higher energy orbit.
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7–5 WHY are the electron energy levels in atoms quantized? Big question:
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de Broglie’s theory and the double slit experiment had already shown that the electron has a wave nature Erwin Schrodinger developed wave mechanics by emphasizing the wave nature of the electron and assuming it must be a standing wave. Erwin Schrodinger, 1933 Nobel Prize
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7–7 The Standing Waves Caused by the Vibration of a Guitar String 2D standing waves video Ever seen a tuning fork?
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7–8 The Hydrogen Electron Visualized as a Standing Wave Around the Nucleus
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Ψ = EΨ Schrodinger Equation Ψ is called wave function (aka orbital) Wave functions are the possible spherical standing waves That is a math problem solved in 1783 – spherical harmonics Erwin Schrodinger, 1933 Nobel Prize
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This note was uploaded on 11/22/2011 for the course CHEM 102 taught by Professor Peterpastos during the Spring '08 term at CUNY Hunter.

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Atomic structure - In the previous lecture we talked about the idea that light can be seen to be a wave by double slit experiment demonstrating the

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