VSEPR ONLY Chem Chapter 6

VSEPR theory

Valence-shell electron-pair repulsion theory; because electron pairs repel, molecules adjust their shapes so that valence electron pairs are as far apart as possible

Linear - Atoms bonded to central atom

2

Linear - Lone pairs of electrons

0

Linear - Type of molecule

AB₂

Trigonal-planar - Atoms bonded to central atom

3

Trigonal-planar - Lone pairs of electrons

0

Trigonal-planar - Type of molecule

AB₃

Bent or Angular (1 lone pair) - Atoms bonded to central atom

2

Bent or Angular (1 lone pair) - Lone pairs of electrons

1

Bent or Angular (1 lone pair) - Type of molecule

AB₂E

Tetrahedral - Atoms bonded to central atom

4

Tetrahedral - Lone pairs of electrons

0

Tetrahedral - Type of molecule

AB₄

Trigonal-pyramidal - Atoms bonded to central atom

3

Trigonal-pyramidal - Lone pairs of electrons

1

Trigonal-pyramidal - Type of molecule

AB₃E

Bent or Angular (2 lone pairs) - Atoms bonded to central atom

2

Bent or Angular (2 lone pairs) - Lone pairs of electrons

2

Bent or Angular (2 lone pairs) - Type of molecule

AB₂E₂

Trigonal-bipyramidal - Atoms bonded to central atom

5

Trigonal-bipyramidal - Lone pairs of electrons

0

Trigonal-bipyramidal - Type of molecule

AB₅

Octahedral - Atoms bonded to central atom

6

Octahedral - Lone pairs of electrons

0

Octahedral - Type of molecule

AB₆.

Linear VSEPR Diagram

180 degrees

Trigonal-planar VSEPR Diagram

120 degrees

Bent or angular (1 lone pair) VSEPR Diagram

120 degrees

Tetrahedral VSEPR Diagram

109.5 degrees

trigonal-pyramidal VSEPR Diagram

107 degrees

Octahedral VSEPR Diagram

90 degrees

Bent or angular (2 lone paris) VSEPR Diagram

104.5 degrees

Triognal Bipyramidal VSEPR Diagram

90 and 120 degrees