11-23-10 - Lecture 15 - Chapter 10

11-23-10 - Lecture 15 - Chapter 10 - Chapter 10: Chapter...

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Chapter 10: Chapter 10: Shapes of Molecules Shapes of Molecules Cocaine Cocaine water water BF BF 3 3 aspirin aspirin
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Bond Order Valence or bond order is # of bonds an element forms C is generally tetravalent; forms 4 bonds (except CO) N is generally trivalent, forms 3 bonds O generally forms 2 bonds In compounds in this course, H forms one bond, and is the terminal atom.
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Writing Lewis Structures: A Systematic Approach 1. Count total number of valence electrons Group number (A or B) = # of valence e - Add electron for each negative charge Subtract electron for each positive charge Don’t worry about which electron comes from which atom
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Writing Lewis Structures: A Systematic Approach 2. Write symbols for atoms and draw single bond (each bond represents two electrons) from central atom to each peripheral or terminal (outside) atom. H atom is terminal atom in molecules we will consider Often, atoms are written in order they are connected Central atom is usually written first » Usually the atom with the lowest electronegativity
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11-23-10 - Lecture 15 - Chapter 10 - Chapter 10: Chapter...

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