CH 301 CH13 notes part 3

CH 301 CH13 notes part 3 - Chapter 13 part 3 VSEPR theory...

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Chapter 13 part 3 VSEPR theory VSEPR = V alence S hell E lectron R epulsion - determines the likely shape of a molecule - bonds and lone pairs repel- keep them apart! - does not describe how the bonding occurs USING VSEPR THEORY: General concept: 1. Draw correct Lewis dot structure for molecule or ion 2. Count RHED around central atom. 3. Predict ELECTRONIC geometry: arrangement of ALL RHED around central atom - keep lone pairs as far apart as possible 4. Predict MOLECULAR geometry: ACTUAL ‘shape’ of molecule - lone pairs are “invisible” WHAT’S A RHED? REGION of HIGH ELECTRON DENSITY Any area where valence electrons are found. Look at the central atom of the molecule: SINGLE, DOUBLE, TRIPLE bonds AND lone pairs are EACH considered ONE RHED. USING VSEPR THEORY: Electrons repel each other. What 3D shapes permit the regions of electrons to be as separated as possible? VSEPR THEORY : POSSIBLE ELECTRONIC GEOMETRIES RHED ELECTRONIC GEOM. ANGLES 2 linear 180° 3 trigonal planar 120°
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CH 301 CH13 notes part 3 - Chapter 13 part 3 VSEPR theory...

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