# How do you determine steric numbers?

Jul 14, 2018

For instance for $S {F}_{4}$ there are FOUR $S - F$ $\sigma - \text{bonds}$, PLUS ONE lone pair associated with the central sulfur atom. And so for $S {F}_{4}$, whose geometry is based on a trigonal bipyramid, the steric number is $5$... And the steric number directly gives ELECTRONIC geometry...$2 = \text{linear}$, $3 = \text{trigonal planar}$, $4 = \text{tetrahedral}$, $5 = \text{trigonal bipyramdal}$, 6=??..
The steric number determines $\text{ELECTRONIC NOT MOLECULAR GEOMETRY....}$