Valence Shell Electron Pair Repulsion Theory: VSEPR

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Presentation transcript:

Valence Shell Electron Pair Repulsion Theory: VSEPR Molecular GeometrIES Valence Shell Electron Pair Repulsion Theory: VSEPR

ELECTRONS & BONDS

Regions of Electron Density ED: 4 4 Bonds ED: 4 3 Bonds, 1 Pair ED: 4 2 Bonds, 2 Pairs

MOLECULES EXIST IN 3 DIMENSIONS! METHANE: TETRAHEDRAL

METHANE VS. AMMONIA METHANE AMMONIA ED BONDS LONE e- PAIRS BOND ANGLE GEOMETRY

VSEPR Theory THE GEOMETRY OF A MOLECULE IS DETERMINED BY ELECTROSTATIC REPULSIONS ABOUT THE CENTRAL ATOM: BOND/LONE PAIR (MORE REPULSION!) BOND/BOND (LESS REPULSION!)

MOLECULES EXIST IN 3 DIMENSIONS! WATER: BENT

MOLECULAR GEOMETRIES

LET’S PRACTICE! TRY: SF4 SO42- PCl5 SO3 Predict the molecular geometries of the following compounds by determining the regions of electron density and the lone pairs about the central atom: OF2 PF3 CS2 NSF TRY: SF4 SO42- PCl5 SO3

O XYGEN DIFLUORIDE

PHOSPHORUS TRIFLUORIDE

CARBON DISULFIDE