Oxidation number based on electronegativity

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= Oxidation number: Based on electronegativity differences, keeps track of which atoms more tightly hold onto shared electron pairs in a covalent bond Compare oxidation number and formal charge for some simple molecules and polyatomic ions 94 S. Ensign, chemical bonding
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•Compare oxidation number and formal charge for some simple molecules and polyatomic ions 95 S. Ensign, chemical bonding
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Importance of oxidation numbers? • Keeping track of electron gain/loss in Keeping track of electron gain/loss in oxidation/reduction reactions •An atom in a compound is “oxidized” (undergoes An atom in a compound is oxidized (undergoes oxidation)if it’s oxidation number increases during the course of a chemical reaction An atom in a compound is “reduced” (undergoes reduction) if it’s oxidation number decreases during the course of the chemical reaction 96 S. Ensign, chemical bonding
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Importance of oxidation numbers? Keeping track of electron gain/loss in oxidation/reduction reactions An atom in a compound is “oxidized” if it’s oxidation number increases during the course of a chemical reaction An atom in a compound is “reduced” if it’s oxidation number decreases during the course of the chemical reaction 97 S. Ensign, chemical bonding
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Concept check • Ionic bonding Ionic bonding Covalent bonding Electronegativity – Electronegativity Polar covalent bond • Nonpolar covalent bond – Lewis structures Octet rule Octet violations – Resonance F l h – Formal charge – Bond strength O id ti b Oxidation number 98 S. Ensign, chemical bonding
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