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Properties of Bonds Polarity Bond Order Bond Length Bond Energy

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**Electronegativity Bond Polarity**

Electronegativity: ability of a bonded atom to attract the shared electrons towards itself Origin: Orbital Energies Trends:

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**Continuum from Covalent to Ionic Bonding: Bond Character**

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**Bond Order: # of bonds between two atoms**

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Bond Length

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**Bond Energy: Energy to separate two bonded atoms**

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**Bond Energy in Ionic Compounds: Lattice Energy**

Energy to separate all the ions NaCl(s) Na+(g) + Cl-(g) H = Lattice E = -790 kJ/mol

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**Properties inside Molecules**

Resonance Formal Charge Oxidation Number Partial Charge

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**Resonance and Bond Order**

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**Resonance Structures:**

When more than one reasonable Lewis Structure is possible

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**Formal Charge and Oxidation Number Examples**

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Partial Charge

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**Lewis # Structural Electron Molecular**

Structure Pairs Geometry Geometry # Structural Pairs = # bonded # lone on central atom atoms pairs

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**# Structural Pairs determines Electron Pair Geometry**

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**# Structural Pairs determines Electron Pair Geometry**

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**# Structural Pairs determines Electron Pair Geometry**

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**Molecular Geometry = Electron Pair Geometry, ignoring lone pairs**

BF3 and O3

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**Molecular Geometry = Electron Pair Geometry, ignoring lone pairs**

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**Molecular Geometry = Electron Pair Geometry, ignoring lone pairs**

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**Molecular Geometry = Electron Pair Geometry, ignoring lone pairs**

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