ch.6 - 10/3/2009 The Modern Atom - Structure Structure of...

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10/3/2009 1 The Modern Atom - Structure Structure of the nucleus not well understood: Particles all interact with each other Internal constituents of the protons and neutrons interact Nuclear force, the strong nuclear force, not wel understood well understood Very high energies needed for study The Modern Atom - Structure Structure of the atom is well understood: Electrons flow around the nucleus Bound to the central positive nucleus by the electromagnetic force: Opposit Charge Attrac Opposite Charges Attract Experimentally easy energies needed for study
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10/3/2009 2 Chemistry and the Modern Atom Atoms bind together using their electrons Chemistry is based in the physics of electrons in atoms We understand electrons in atoms well enough to understand chemistry at a high level The Scientific Method: Tentative All “ Natural Laws ” are uncertain and are subject to change when human experience runs contrary to these laws. Newton’s Laws of Motion Newtonian Gravitation Replaced by… Quantum Mechanics Relativity
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10/3/2009 3 Introduction to Quantum Mechanics Quantum mechanics is the most important scientific and philosphical development in the last 100 years, possibly since Galileo and Newton. If you are not confused by Quantum Physics then you haven't really understood it. Niels Bohr What are the Goals (Chapter 6)? Understand the relationships between light, energy, frequency and wavelength. Understand both the wave nature and quantized nature of light. Learn about line spectra for atoms, how the Bohr model of the atom explains them, and what this tells us about atoms. Learn about the wave behavior of matter Learn about the wave behavior of matter. Learn about quantum mechanics and how they predict atomic orbitals. Understand the energy, physical shape and nature of atomic orbitals.
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10/3/2009 4 Chapter 6 Goals (continued) Learn about electron spin and the Pauli Exclusion Principle. Understand electron configurations for atoms Understand electron configurations for atoms. Learn about the relationship between atomic orbitals, electron configurations and the organization of the periodic table. Quantum Mechanics, Atoms, Orbitals In order to make sense of this, we will present experimental observations based on light and a useful (but not completely correct) model of the atom to explain the results. Then we will dive into quantum mechanics, which does a better job of explaining the atom and chemistry of atoms (physics of electrons). First we must define light in more scientific terms – What is light? All Light (visible, invisible) is Electromagnetic Radiation
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10/3/2009 5 = the emission/transmission of energy via space in form of waves W ave = periodic disturbance or oscillation passing through space (or any matter) in a continuous manner An electromagnetic wave consists of electrical and magnetic fields vibrating in planes which are perpendicular to each other Note: !
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ch.6 - 10/3/2009 The Modern Atom - Structure Structure of...

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