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Molecular Geometry

Topic Review on "Title":

Valence Shell Electron Pair Repulsion Theory
Bonds are made of electrons and electrons are negative and therefore repel each other.  Bonds and lone pairs form as far apart from each other as possible.  This theory can be used to determine the electron structure (the 3D shape based upon electron regions—bonding regions and lone pair regions—of the central atom) or molecule structure (the 3D shape based on the electron regions, but named after the bonded atoms only).

A = central atom; X = ligands; E = lone pairs

Electron regions

Molecular Formula

Name

2

AX2

Linear

3

AX3

Trigonal Planar

3

AX2E

Bent

4

AX4

Tetrahedron

4

AX3E

Trigonal pyramidal

4

AX2E2

Bent

5

AX5

Trigonal bipyramidal

5

AX4E

See-saw

5

AX3 E2

T-shaped

5

AX2E3

Linear

6

AX6

Octahedron

6

AX5E

Square pyramidal

6

AX4 E2

Square planar

Rapid Study Kit for "Title":
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Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :
Lewis structures are a way to represent molecules in two dimensions. Lewis structures show the atoms and their valence electrons and in what ways the electrons are shared or transferred to form bonds. This tutorial uses the Valence Shell Electron Pair Repulsion Theory to determine molecular geometry.

Tutorial Features:

Specific Tutorial Features:

  • 3D visualization of molecular geometry 

Series Features:

  • Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
  • Definition slides introduce terms as they are needed.
  • Visual representation of concepts
  • Animated examples—worked out step by step
  • A concise summary is given at the conclusion of the tutorial.

"Title" Topic List:
  • Valence Shell Electron Pair Repulsion Theory
    • Used to determine electron geometry
    • Used to determine molecular geometry


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