chm115_lecture8 - Chemistry 115 Lecture 8 Outline Chapter 6...

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Chemistry 115 Lecture 8 Outline Chapter 6 Wave behavior of matter The Uncertainty Principle Intro to Quantum Mechanics EXAM Tuesday Feb. 15 Recitation: Ch 23: Nuclear Reactions, Radiation, Doses, Nuclear Medicine and chapter wrap-up. 1
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Quantum Theory and the Electronic Structure of Atoms Think of atoms as the building blocks of molecules: The electrons associated with each atomic nucleus form an orbital structure that leads to chemical bonds In Chapter 6, we will learn where that orbital structure comes from Quantum Mechanics: Quantum mechanical nature of electrons Developed in 1920’s -1930’s by Einstein, Schrödinger, Heisenberg, Bohr & others. QM gives a much deeper & thorough explanation of chemistry, bonding, and periodic properties. We will cover this subject by first asking ourselves the following questions, which we will then answer over the next 2-3 lectures: 2
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7 Questions on Atomic Structure (Ch 6) 1) Why does light interfere with itself, causing constructive & destructive interferences? 1) Why can some light excite an electron from a metal surface & some cannot? 1) Why does the light from gases consist of discrete lines at certain colors or wavelengths? 1) Why can we not describe the electron’s motion around the nucleus, such as we can for planets? 1) Why do different atoms absorb or emit light of different energies or wavelengths? 1) Why are some atoms so reactive, and others unreactive? 1) How does quantum mechanics help explain the structure of the periodic chart? 3
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The Wave Nature of Light (Q1) Light is a form of electromagnetic radiation . Radiation carries energy through space. Electromagnetic radiation is characterized by its wave nature.
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This note was uploaded on 04/09/2011 for the course CHM 115 taught by Professor Towns during the Spring '08 term at Purdue University-West Lafayette.

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chm115_lecture8 - Chemistry 115 Lecture 8 Outline Chapter 6...

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