MUIDS Accelerated Chemistry Molecular Geometry key terms

Name of structure with 2 electron groups

Linear

Name of electron structure with 3 electron groups

Trigonal- planar

Name of electron structure with 4 electron groups

Tetrahedral

Name of electron structure with 5 electron groups

Trigonal bi-pyramidal

Name of electron structure with 6 electron groups

octahedral

Linear structure Ideal bond angle

180°

2 outer atoms

linear

2 outer atoms with 1 free electron pair

bent

Bond angle of bent structure

<180° (120°)

Trigonal planar ideal bond angles (2)

120° horizontal and 90° vertical

3 outer molecules

Trigonal planar

2 outer molecules with 2 lone pairs

Bent

Trigonal pyramidal bond angle

107.3°

4 outer molecules

Tetrahedral

3 bonding pairs with 1 lone pair

Trigonal pyramidal

2 outer molecules with 2 lone pairs

bent

2 lone pair 2 bonding pair bond angle

104.5°

5 bonding pairs

Trigonal bipyramidal

Trigonal bipyramidal bond angles (2)

90° and 120°

4 bonding pairs with 1 lone pair

Distorted tetrahedron

Distorted tetrahedron bond angles (2)

120° and >90°

3 bonding pairs with 2 lone pairs

T shaped

T shaped bond angle

<90°

Octahedral

6 bonding pairs

5 bonding pairs and 1 lone pair

square pyramidal

Square pyramidal bond angle

90°

Square plainar bond angle

90°