Practice!

Sample Problem

Which of the following are molecular geometries of the trigonal bipyramidal electron geometry?

Seesaw

T-shaped

Square planar

Bent

Linear

Solution

The molecular geometries with trigonal bipyramidal electron geometry (5 bonding sites) are:

i.                    Trigonal bipyramidal (5 bonding groups, 0 lone pairs)

ii.                  Seesaw (4 bonding groups, 1 lone pair)

iii.                T-shaped (3 bonding groups, 2 lone pairs)

iv.                Linear (2 bonding groups, 3 lone pairs)