Chemistry_1031_day34_041709

Chemistry_1031_day34_041709 - Dr. Jonathan M. Smith Friday,...

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Unformatted text preview: Dr. Jonathan M. Smith Friday, April 17 General Chemistry I CHE-1031 Today y Navigating the periodic table with your quantum compass: y Ch. 8 y Read Ch. 8 y Periodic table Mastering Chemistry, due Saturday y In-class exam Monday y Chapter 6, 7, 8 y Review in Beury 121 4 PM Chapter 8 Navigating the periodic table with your quantum compass Periodic Pattern 4 m = metal, nm = nonmetal, m/nm = metalloid Tro, Chemistry: A Molecular Approach 5 Properties & Electron Configuration y elements in the same column have similar chemical and physical properties because they have the same number of valence electrons in the same kinds of orbitals Tro, Chemistry: A Molecular Approach 6 Tro, Chemistry: A Molecular Approach 7 Electron Configuration of Anions in their Ground State y anions are formed when atoms gain enough electrons to have 8 valence electrons y filling the s and p sublevels of the valence shell y the sulfur atom has 6 valence electrons S atom = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 4 y in order to have 8 valence electrons, it must gain 2 more S 2- anion = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 Tro, Chemistry: A Molecular Approach 8 Electron Configuration of Cations in their Ground State y cations are formed when an atom loses all its valence electrons y resulting in a new lower energy level valence shell y however the process is always endothermic y the magnesium atom has 2 valence electrons Mg atom = 1 s 2 2 s 2 2 p 6 3 s 2 y when it forms a cation, it loses its valence electrons Mg 2+ cation = 1 s 2 2 s 2 2 p 6 Tro, Chemistry: A Molecular Approach 9 Trend in Atomic Radius Main Group Different methods for measuring the radius of an atom, and they give slightly different trends y van der Waals radius = nonbonding y covalent radius = bonding radius y atomic radius is an average radius of an atom based on measuring large numbers of elements and compounds Atomic Radius Increases down group y valence shell farther from nucleus...
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This note was uploaded on 05/09/2010 for the course CHEM 1031 taught by Professor Thomas during the Spring '06 term at Temple.

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Chemistry_1031_day34_041709 - Dr. Jonathan M. Smith Friday,...

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