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Chemistry Bonding VSEPR and Bond Angle. Do Now: Take out HW to check CALCULATORS NOT REQUIRED PERIODIC TABLES REQUIRED. Stands for V alence S hell E lectron P air R epulsion T heory. Explains the 3-D shape of molecules. There are two main factors in a molecule’s shape:

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chemistry bonding vsepr and bond angle
ChemistryBondingVSEPR and Bond Angle

Do Now: Take out HW to check

CALCULATORS NOT REQUIRED

PERIODIC TABLES REQUIRED

vsepr theory
Stands for Valence Shell Electron Pair Repulsion Theory.

Explains the 3-D shape of molecules.

There are two main factors in a molecule’s shape:

Electron Domain Geometry – how many places can electrons be found on the central atom?

Bonding Domain Geometry – how many places can bonds be found?

Comparing these two gives us a molecule’s shape.

VSEPR Theory
electron domains
VSEPR theory states that electrons want to be as far apart from each other as possible.

The number of electron domains, or how many “places” electron pairs are found, determines part of the 3-D shape.

Double and triple bonds count as a single electron domain.

Electron Domains
electron domain geometry
The number of electron domains on an atom determines its electron geometry and bond angle:

4 electron domains – tetrahedral

Bond angle: 109.5º

3 electron domains – trigonal planar

Bond angle: 120º

2 electron domains – linear

Bond angle: 180º

Electron Domain Geometry
tetrahedral electron domain
Tetrahedral Electron Domain
  • Tetrahedral Electrons – 4 electron domains (4 places there are electrons on central atom)
  • Molecular Shapes (all bond angles 109.5º)
trigonal planar electrons
Trigonal Planar Electrons
  • Trigonal Planar Electrons – 3 places electrons are found on central atom
  • Molecular Shapes (all bond angles 120º)
linear electrons
Linear Electrons
  • Linear Electrons – 1 or 2 places electrons are found on central atom
  • Linear Molecule Shapes (all bond angles 180º)
  • Examples: CO2, H2