(Quizlet Import) AP Chemistry Homework - 2.7: VSPER Theory Models

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Steric number

How many electron dense areas are attached to the central atom (number of atoms bonded to central atom + number of lone pairs on central atom)

Electron geometry of steric number 2 molecule

Linear

Electron geometry of steric number 3 molecule

Trigonal planar

Electron geometry of steric number 4 molecule

Tetrahedral

Electron geometry of steric number 5 molecule

Trigonal bipyramidal

Electron geometry of steric number 6 molecule

Octahedral

Molecular geometry: Steric number: 2 --> 2 Bond domains, 0 Lone pairs

Linear, exactly 180°

Molecular geometry: Steric number: 3 --> 3 Bond domains, 0 Lone pairs

Trigonal planar, exactly 120

Molecular geometry: Steric number: 3 --> 2 Bond domains, 1 Lone pair

Bent, less than 120°

Molecular geometry: Steric number: 4 --> 4 Bond domains, 0 Lone pairs

Tetrahedral, exactly 109.5°

Molecular geometry: Steric number: 4 --> 3 Bond domains, 1 Lone pair

Trigonal pyramidal, less than 109.5°

Molecular geometry: Steric number: 4 --> 2 Bond domains, 2 Lone pairs

Bent/Angular, less than 109.5°

Molecular geometry: Steric number: 5 --> 5 Bond domains, 0 Lone pairs

Trigonal bipyramidal, exactly 120° and 90°

Molecular geometry: Steric number: 5 --> 4 Bond domains, 1 Lone pair

Sawhorse/Seesaw, less than 120° and 90°

Molecular geometry: Steric number: 5 --> 3 Bond domains, 2 Lone pairs

T-shaped, less than 90° and 180°

Molecular geometry: Steric number: 5 --> 2 Bond domains, 3 Lone pairs

Linear, exactly 180°

Molecular geometry: Steric number: 6 --> 6 Bond domains, 0 Lone pairs

Octahedral, exactly 90°

Molecular geometry: Steric number: 6 --> 5 Bond domains, 1 Lone pair

Square pyramidal, less than 90° and 180°

Molecular geometry: Steric number: 6 --> 4 Bond domains, 2 Lone pairs

Square planar, exactly 90° and 180°

Molecular geometry: Steric number: 6 --> 3 Bond domains, 3 Lone pairs

T-shaped, less than 90° and 180°

Molecular geometry: Steric number: 6 --> 2 Bond domains, 4 Lone pairs

Linear, exactly 180°