Chapter_5 Sep_28 Lecture_17.pptx

Electronegativity and polarity x y nonpolar covalent

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Electronegativity and Polarity X Y Nonpolar covalent bond X Y δ + δ- Polar covalent bond X Y + - Ionic bond Shared e pair right in the middle of X and Y X and Y have similar pulling strength on shared e Shared e pair is closer to Y Y has stronger pulling strength than X Partial negative charge on Y and partial positive charge on X No e sharing but e transferring Y has much stronger pulling strength than X Y carries negative charge and X carries positive charge
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Electron density maps show the distributions of electron density. nonpolar covalent Electrons are shared equally polar covalent Electrons are not shared equally and are more likely to be associated with F ionic Electrons are not shared but rather transferred from Na to F red high electron density green intermediate electron density blue low electron density Electronegativity and Polarity
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Electronegativity is the ability of an atom in a compound to pull electrons to itself Electronegativity and Polarity
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Relative scale (measured in relation to other atoms) Related to IE and EA Unitless Smallest electronegativity: Cs = 0.7 Largest electronegativity: F = 4.0 Electronegativity and Polarity
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Electronegativity varies with atomic number.
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  • Atom, Chemical bond

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