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ch910 1_Part5 - GENERAL CHEMISTRY CHAPTER 9 CHAPTER 10 PART...

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GENERAL CHEMISTRY CHAPTER 9 & CHAPTER 10: PART I – CHEMICAL BONDING P AGE 17 OF 22 If the bonds are NOT identical, the observed bond angles are slightly different from ideal The Effect of Lone Pairs Lone pair groups “occupy more space” on the central atom Their electron density is exclusively on the central atom rather than shared like bonding electron groups Relative sizes of repulsive force interactions is: Lone Pair Lone Pair > Lone Pair Bonding Pair > Bonding Pair – Bonding Pair This effects the bond angles, making them smaller than expected 4 Charge Clouds 4 charge clouds = 4 electron groups around the central atom If there are no lone pairs on the central atom, geometry = tetrahedral The bond angle is 109.5° If there is 1 lone pair on the central atom, geometry = trigonal pyramid The bond angle is 107° If there are 2 lone pairs on the central atom, geometry = tetrahedral bent The bond angle is 104.5°
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GENERAL CHEMISTRY
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