#Chem 161-2007 Recitation 10th week

#Chem 161-2007 Recitation 10th week - CHEMISTRY 161-2007...

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CHEMISTRY 161-2007 10 th WEEK RECITATION ATTENDANCE E-MAIL Please provide your first and last names and section numbers on all  correspondence. Please provide the citation for any problem you want me to solve. QUIZZES Section 23: Quiz 3, Wed, Nov 7, sections 7.8 – 8.5 Sections 25 & 29, Thu, Nov 8, sections 8.1 – 8.7 EXAM One student who got 72 in the first exam and 100 in the second exam said  that my explanations in the practice problems and weekly recitation notes were  very helpful. MISCELLANEOUS Bring a pencil with an eraser for in-class exercises on effective nuclear  charge vs. periodic table trends. Chem 161-2007 10 th week recitation 1
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PLAN FOR TODAY : CHAPTER 8 • POLYELECTRONIC ATOMS (AUFBAU PRINCIPLE) • PERIODIC TABLE AND PERIODIC PROPERTIES -- Magnetic properties Paramagnetism & Diamagnetism -- Atomic and ionic radius -- Ionization energy -- Electron affinity Chem 161-2007 10 th week recitation 2
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Chem 161-2007 10 th week recitation 3 AUFBAU
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Chem 161-2007 10 th week recitation 4
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AUFBAU PRINCIPLE -- ORDER OF SUBSHELLS ET: “Aufbau” meams “building up” in German ( He) 14 8s 8p 8d 8f 14 Chem 161-2007 10 th week recitation 5
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Magnetic Properties ET: One bit of evidence that the quantum mechanical model is “correct” lies in the magnetic properties of matter. ET: Atoms with unpaired electrons are attracted by magnetic fields and thus are said to exhibit paramagnetism. (para = beside, along with, e.g., paramilitary, paraphrase). The degree to which this effect is observed is directly related to the number of unpaired electrons present in the atom. ET: Atoms with paired electrons are repelled by magnetic fields and thus are said to exhibit diamagnetism (dia = apart; dialysis = separation of parts; going in different directions). Hill & Petrucci 45. Which of the following is diamagnetic and which is paramagnetic? Explain. (a) A Sr atom (b) a F atom (a) 38 Sr = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 5s ↑↓ Diamagnetic because the valence electrons are all paired. (b) 9 F = 1s 2 2s 2 2p 5 2p ↓↑ ↓↑ Weakly paramagnetic because one of the electrons in the valence shell is unpaired. Chem 161-2007 10 th week recitation 6
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Chem 161-2007 10 th week recitation 7
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Chem 161-2007 10 th week recitation 8 SMALLER ATOM SMALLER ION HIGHER FIRST IONIZATION ENERGY ELECTRON AFFINITY HIGHER ELECTRONEGATIVITY LESS METALLIC PROPERTY POOR REDUCING AGENT GOOD OXIDIZING ACIDIC OXIDES
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Chem 161-2007 10 th week recitation 9 PERIODIC TABLE AND PERIODIC PROPERTIES
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ET: Understanding what “effective nuclear charge” is.
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This note was uploaded on 04/12/2008 for the course CHEM 161 taught by Professor Vacillian during the Fall '08 term at Rutgers.

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#Chem 161-2007 Recitation 10th week - CHEMISTRY 161-2007...

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