VSEPR Valence Shell Electron Pair Repulsion Theory Predicting Molecular geometry or molecular shapes.

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Presentation transcript:

VSEPR Valence Shell Electron Pair Repulsion Theory Predicting Molecular geometry or molecular shapes

Bonding electron groups Lone pairs of electrons 2 0 2/0 = liner; 180˚ 3/0 = Trigonal; 120˚ planar 4/0 = Tetrahedral; 109.5˚ 2/0 3/0 4/0

Special cases of tetrahedra Bonding electron groups 3 Lone pairs of electrons 1 3/1 2/2 Lone pairs of electrons 2 2 4/0

Special case of tetrahedra - continued 2/1 Bonding electron groups 2 Lone pairs of electrons 1 Negatively charged electrons in bonds repel each other Bonds stay as far a possible No bonded atom; lone pair closer to central atom (nucleus) Lone pair of electrons push bonded electrons harder Squeeze play

Octate rule and covalent bonds Hydrogen & duet