Lect+10+Fall+2011 - 9/12/2011 ReviewfromLastLecture

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9/12/2011 1 Chapter 2: Protecting the Ozone Layer (continued) Sept. 14/2011 Review from Last Lecture Layers of atmosphere & conc. of O 3 Allotropes Atomic structure 2 What are valence electrons? 1. They are the electrons closest to the nucleus (innermost electrons) 2. They are the electrons furthest from the nucleus (outermost electrons 3 nucleus (outermost electrons) 3. They are the electrons between the innermost and outermost electrons 4. They are nothing special Examples Lithium, sodium, potassium, etc. Total e ? Fluorine, chlorine, bromine, etc. ? Valence e ? Stored in oil–why? 4 Valence e ? Typically reactive, non metals (diatomic), except At
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9/12/2011 2 How many valance electrons in an atom of phosphorus? 1. 2 2. 5 3 8 __________ always corresponds 5 3. 8 4. 15 5. 31 to the number of valence electrons How many valance electrons in an atom of krypton? 1. 2 2. 4 3 8 6 3. 8 4. 36 5. None of the above How many neutrons does an atom of hydrogen ( ) have?
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This note was uploaded on 10/12/2011 for the course ACCOUNTING 221 taught by Professor Staff during the Spring '11 term at North South University.

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Lect+10+Fall+2011 - 9/12/2011 ReviewfromLastLecture

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