Chapter 7 - CHAPTER 7 ELECTRONS IN ATOMS AND PERIODIC...

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CHAPTER 7 ELECTRONS IN ATOMS AND PERIODIC PROPERTIES ATOMIC STRUCTURE AND PERIODICITY KEY QUESTION: WHY ARE CHEMICAL PROPERTIES PERIODIC? Isaac Newton and classical mechanics . .. good for baseballs and planets, not so hot for atoms What we already know . .. atoms = protons and neutrons in the nucleus; electrons = outside the nucleus The issue now: let's be a bit more precise about what/where the electrons are Why? THAT'S WHERE THE CHEMISTRY IS! Quantum mechanics ... incorporation of wave and particle aspects of matter into a single comprehensive theory The early 20th Century was the Century of the electron. But first, let's talk about waves and ELECTROMAGNETIC RADIATION WAVES OF LIGHT: James Clerk Maxwell . .. (1865) . .. light is electromagnetic radiation waves . .. wavelength and frequency hertz . .. amplitude . .. nodes . .. velocity
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  c c = 3.00 x 10 8 m / s IMPORTANT: the electromagnetic spectrum, of which visible light is just a small section
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This note was uploaded on 02/22/2011 for the course CHEM 25 taught by Professor X during the Spring '06 term at Lehigh University .

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Chapter 7 - CHAPTER 7 ELECTRONS IN ATOMS AND PERIODIC...

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