Chemistry_1031_day33_041509_actual

Chemistry_1031_day33_041509_actual - General Chemistry I...

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Dr. Jonathan M. Smith Wednesday, April 15 General Chemistry I CHE-1031
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Today y Navigating the periodic table with your quantum compass: y Ch. 8 y Read Ch. 8 y Quantum Mastering Chemistry due tonight y Periodic table Mastering Chemistry y In-class exam Monday y Chapter 6, 7, 8 y Do your taxes…
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Chemistry in the news… y Engineers Create DNA Sensors That Could Identify Cancer Using Material Only One Atom Thick y Scientists are combining biological materials with graphene, a recently developed carbon material that is only a single atom thick. (Credit: Image courtesy of Kansas State University) y http://www.sciencedaily.com/releases/2009/04/090413141256.htm
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Chapter 8 Navigating the periodic table with your quantum compass
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Periodic Pattern 5 m = metal, nm = nonmetal, m/nm = metalloid
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Allowed Quantum Numbers Tro, Chemistry: A Molecular Approach 6 Quantum Number Values Number of Values Significance Principal, n 1, 2, 3, . .. - distance from nucleus Azimuthal, l 0, 1, 2, . .., n-1 n shape of orbital Magnetic, m l - l ,...,0,. ..+ l 2 l + 1 orientation of orbital Spin, m s -½, +½ 2 direction of electron spin
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Quantum Numbers of Helium’s Electrons y helium has two electrons y both electrons are in the first energy level y both electrons are in the s orbital of the first energy level y since they are in the same orbital, they must have opposite spins nlm l m s first electron 100+ ½ second electron 100- ½ Tro, Chemistry: A Molecular Approach 7
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Electron Configurations 8 y the ground state of the electron is the lowest energy orbital it can occupy y the distribution of electrons into the various orbitals in an atom in its ground state is called its electron configuration y the number designates the principal energy level y the letter designates the sublevel and type of orbital y the superscript designates the number of electrons in that sublevel y He = 1 s 2
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Sublevel Splitting in Multielectron Atoms 9 y the sublevels in each principal energy level of Hydrogen
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Chemistry_1031_day33_041509_actual - General Chemistry I...

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