Molecular Geometry VSEPR.

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Presentation transcript:

Molecular Geometry VSEPR

VSEPR Theory VSEPR theory (Valence Shell Electron-Pair Repulsion) - States that repulsion between the sets of valence electrons surrounding an atom causes these sets to be oriented as far apart as possible. Double and triple bonds are treated as single bondsd

Linear Atoms Bonded to Central Atom= 2 Lone pair of electrons= 0 Bond Angle- 180º Examples BeF2 CO2 HCl

Trigonal Planar Atoms Bonded to Central Atom= 3 Lone pair of electrons= 0 Bond Angle-120º Examples BF3 COCl2

Trigonal planar ---Bent Atoms Bonded to Central Atom= 2 Lone pair of electrons= 1 Bond Angle- Less than 120º Examples SO2 O3

Tetrahedral Atoms Bonded to Central Atom= 4 Lone pair of electrons= 0 Bond Angle= 109.5º Examples CH4 CCl4

Tetrahedral- Bent Atoms Bonded to Central Atom= 2 Lone pair of electrons= 2 Bond Angle- Less than 105º Examples H2O ClO2 OF2

Trigonal Pyramidal Atoms Bonded to Central Atom= 3 Lone pair of electrons= 1 Bond Angel= less than 107.3° Examples; NH3 NF3 PCl3

The following are PAP Only

Trigonal- Bipyramidal Atoms Bonded to Central Atom= 5 Lone pair of electrons= 0 Bond Angel= 90º, 120º, 180º Examples: PF5 PCl5

Octahedral Atoms Bonded to Central Atom= 6 Lone pair of electrons= 0 Bond Angel= 90º, 180º Examples; SF6