Chemical Bonding - Oneonta

Chemical Bonding - Oneonta

Properties of Bonds 1.Polarity 2.Bond Order 3.Bond Length

4.Bond Energy Electronegativity Bond Polarity

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

Trends: Continuum from Covalent to Ionic Bonding: Bond Character

Bond Order: # of bonds between two atoms

Bond Length Bond Energy: Energy to separate two bonded atoms

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

Properties inside Molecules 1.Resonance 2.Formal Charge

3.Oxidation Number 4.Partial Charge

Resonance and Bond Order Resonance Structures: When more than one reasonable Lewis Structure is possible

Formal Charge and Oxidation Number Examples

Partial Charge Lewis

Structure # Structural

Pairs # Structural Pairs = # bonded

atoms Electron Geometry

+

# lone pairs

Molecular Geometry

on central atom # Structural Pairs determines Electron Pair Geometry

# Structural Pairs determines Electron Pair Geometry # Structural Pairs determines Electron Pair Geometry

Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

BF3 and O3 Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

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