6.6: VESPR theory

Two electron groups: state the notatio, bond angle, and molecular shape name

Notation: AX2

bond angle:180°

Molecular shape name: Linear

List all the types of electron groups for 3 electron group configurations

1. AX₃

2. AX₂E

Molecular shape name for AX_{3 + bond angle}

Name: Trigonal planar

Bond angle: 120°

Molecular shape name for AX₂E + bond angle

Name: Bent/angular

Bond angle: less than 120°

List all the types of electron groups for 4 electron group configurations

AX₄ AX₃E, AX₂E₂

Molecular shape name for AX₄ + bond angle

Name: Tetrahedral

Bond angle: all angles are 109.5°

Molecular shape name for AX₃E + bond angle

Name: Trigonal pyramidal

Bond angle: 107°

Molecular shape name for AX₂E₂ + bond angle

Name: Bent/angular

Bond angle: 104.5°

List all the types of electron groups for 5 electron group configurations

AX₅, AX₄E, AX₃E₂, AX₂E₃

Molecular shape name for AX₅

Name: Trigonal bipyramidal 90 and 120

Molecular shape name for AX₄E + bond angles

Name: seesaw 90 and 180

Molecular shape name for AX₃E₂

Name: T-shaped

Molecular shape name for AX₂E₃ + bond angle

Name: Linear and 180°

List all the types of electron groups for 6 electron group configurations

AX₆, AX₅E, AX₄E₂

Molecular shape name for AX₆ + bond angle

Name: Octahedral

Bond angle: 90°

Molecular shape name for AX₅E

Name: Square pyramidal

Molecular shape name for AX₄E₂ + bond angles

Name: Square planar

Bond angles:

lying adjacent to each other at 90°

opposite to each other by 180°