Steric number = 5
For trigonal bipyramidal geometry, there are two possible locations of lone pairs, axial
and equatorial. If there is a single lone pair, for example in SF4, the lone pair occupies
an equatorial position. This position provides the lone pair with the most space and minimizes
the interactions between the lone pair and bonding pairs. If the lone pair were
axial, it would have three 90" interactions with bonding pairs; in an equatorial position
it has only two such interactions, as shown in Figure 3-1 1. The actual structure is distorted
by the lone pair as it spreads out in space and effectively squeezes the rest of the
molecule together.
Steric number = 5For trigonal bipyramidal geometry, there are two possible locations of lone pairs, axialand equatorial. If there is a single lone pair, for example in SF4, the lone pair occupiesan equatorial position. This position provides the lone pair with the most space and minimizesthe interactions between the lone pair and bonding pairs. If the lone pair wereaxial, it would have three 90" interactions with bonding pairs; in an equatorial positionit has only two such interactions, as shown in Figure 3-1 1. The actual structure is distortedby the lone pair as it spreads out in space and effectively squeezes the rest of themolecule together.
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