CHEM 125 - Molecular/Electron Geometry

Electron Geometry?

2 Electron Groups

Linear

Electron Geometry?

3 Electron Groups

Trigonal Planar

Electron Geometry?

4 Electron Groups

Tetrahedral

Electron Geometry?

5 Electron Groups

Trigonal Bipyramidal

Electron Geometry?

6 Electron Groups

Octahedral

Molecular Geometry?

2 Electron Groups (0 Lone Pairs)

Linear

Molecular Geometry?

3 Electron Groups (0 Lone Pairs)

Trigonal Planar

Molecular Geometry?

3 Electron Groups (1 Lone Pair)

Bent/Angular

Molecular Geometry?

4 Electron Groups (0 Lone Pairs)

Tetrahedral

Molecular Geometry?

4 Electron Groups (1 Lone Pair)

Trigonal Pyramid

Molecular Geometry?

4 Electron Groups (2 Lone Pairs)

Bent/Angular

Molecular Geometry?

5 Electron Groups (0 Lone Pairs)

Trigonal Bipyramidal

Molecular Geometry?

5 Electron Groups (1 Lone Pair)

Sawhorse/Seesaw

Molecular Geometry?

5 Electron Groups (2 Lone Pairs)

T-Shape

Molecular Geometry?

5 Electron Groups (3 Lone Pairs)

Linear

Molecular Geometry?

6 Electron Groups (0 Lone Pairs)

Octahedral

Molecular Geometry?

6 Electron Groups (1 Lone Pair)

Square Pyramid

Molecular Geometry?

6 Electron Groups (2 Lone Pairs)

Square Planar

Molecular Geometry?

6 Electron Groups (3 Lone Pairs)

T-Shape

Molecular Geometry?

6 Electron Groups (4 Lone Pairs)

Linear

When is Electron Geometry the same as Molecular Geometry

When a molecule has 0 Lone Pairs

What does VSEPR stand for?

Valence Shell Electron Pair Repulsion

(model based on how electrons want to be as far away from each other as possible)

What is Electron Geometry?

Geometry determined by electron groups (lone pairs + bonds)

What is Molecular Geometry?

Geometry determined by electron groups, but only with atoms (no lone pairs)