CHEM 0110 Chapter Notes - Chapter 10: Molecular Orbital Theory, Vsepr Theory, Chlorine
Document Summary
The direction in space of the bonding pair gives you the molecular geometry. Central atom with two, three, or four valence-shell electron pairs: two electron pairs (linear arrangement). Four electron pairs: tetrahedral, but can be tetrahedral, trigonal pyramidal, or bend depending on bonds vs lone pairs. Determine number of electron pairs around central atom, if resonance occurs, use one resonance formula. Determine arrangement of the pairs around the central atom. Obtain the molecular geometry from the directions of bonding pairs for this arrangement. Bond angles and the effect on lone pairs: a lone pair tends to require more room than a bonding pair. multiple bonds require more space than single bonds. Central atom with five or six valence shell electrons: 5 electrons pairs tends to have trigonal bipyramidal arrangement. 5 domains: trigonal bipyramidal take one off side=seesaw, t-shaped linear. 6 domains: octahedral, take one off top or bottom square pyramidal square planar.
