Blake Lecture 10-8-08

Blake Lecture 10-8-08 - Which is a valid set of quantum...

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Blake 10-8-08 Chemistry Ex 1: Which transition involves the emission of the longest wavelength? 1. N = 1 > n = 6 2. N = 2 > n = 1 3. N = 4 > n = 2 - ANSWER 4. N = 2 > n = 3 Describing an electron An electron in an atom is described by a unique set of 4 quantum numbers Quantum numbers have letter abbreviations, algebraic limitations, physical correspondences and names. Quantum Numbers Letter Name Lower Upper Meaning N 1 infinity Energy Level L 0 n-1 E sublevel shape M -l +l orientation S The n = 3 level: Analysis 3 rd Energy Level Sublevels (l) 1. 2. 3. 0(s), 1(p), 2(d) 4. # of Orbitals for each sublevel 1. l = 0 m = 0 2. l = 1 m = -1,0,+1 3. l = 2 m = -2,-1,0,+1,+2 - Within the “d” sublevel there are 5 Orbitals 2 electrons for each orbital 1. 3s 2 (1 orbital) > n = 3 , l = 0, m = 0 2. 3p 6 (3 Orbitals) >n = 3, l = 1, m = -1,0,+1 3. 3d 10 (5 Orbitals)
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Ex 2: How many electrons in an atom can have n = 5 and l = 1? 1. 0 2. 2 3. 3 4. 6 - ANSWER 5. 8 l = 0 5s l = 1 5p 6 Ex 3:
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Unformatted text preview: Which is a valid set of quantum numbers (n,l,m,s) for an atom? 1. 100, 0, 0, ½ - ANSWER 2. 5, 1,1, 0 3. 3, 3, 0, -1/2 4. 5, 1, 2, -1/2 5. All of the above are valid 6. None of the above are valid Electron Configurations • Summarize the set of all electrons in an atom, molecule, or ion • Ground state-the lowest energy configurations 1. Most Stable – Lowest E Levels • Line representation and box representation 1. Each orbital is a box The Rules • Hund’s Rule 1. If multiple orbitals in same sublevel, 1 electron in each before pairing. Electrons repel each other • Pauli Exclusion Principle 1. No two electrons can have the same set of quantum numbers (HOUSE ADDRESS) 2. Only two electrons in each orbital and must have opposite spin from each other • Aufbau 1. Filling Order Ex 4: What is the electronic configuration of Na? • Na = 11e-• 1s 2 2s 2 2p 6 3s 1...
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Blake Lecture 10-8-08 - Which is a valid set of quantum...

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