With this model in mind, the molecular geometry can be determined
in a systematic way.
Lewis diagrams provide information
about what atoms are bonded to each other and the total electron
pairs involved.
Electron pair geometry is determined
from the total electron pairs.
Molecules can then be divided into two groups:
Group 1: Molecules with NO lone electron pairs. In
this case the molecular geometry is identical to the electron
pair geometry.
Group 2: Molecules with one or more lone electron pairs.
In this case an extra step is needed to to translate from electron
pair geometry to the final molecular geometry, since only the
positions of bonded atoms are considered in molecular geometry.
