c101_f10_1124 - Lewis structure A picture that shows the...

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Lewis structure A picture that shows the covalent bonds for a molecule. Does not show accurately the location of all the electrons in the molecule. Does not show accurately the shape or bonding angles of the molecule. Example : H 2 O Drawing and understanding Lewis structures are starting points for Chapter 9 (CHEM 102) and for organic chemistry. You need to practice drawing and understanding them until they are easy for you. (Sections 8.2-8.4, 8.7-8.8)
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Chemistry 101 Fall 2010 2 General rules (see handout) : 1. Count the valence electrons. 2. Arrange the atoms. Usually a central atom is surrounded by ligands (outer atoms or groups). The outer groups are the more electronegative atoms; the central atom is usually the least electronegative atom because it will be forced to share electrons with the outer groups. H is never a central atom. 3. Distribute bonding pairs between atoms (for each bond, 2 electrons are shared by the bonded atoms). Note that C prefers 4 bonds, N prefers 3 bonds, O prefers 2 bonds, and
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c101_f10_1124 - Lewis structure A picture that shows the...

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