Final answer:
The electron group geometry and molecular geometry are different. The electron group geometry refers to the arrangement of all electron pairs around a central atom, while the molecular geometry only considers the arrangement of atoms in a molecule. They will be the same when there are no lone pairs and different when there are lone pairs on the central atom.
Step-by-step explanation:
The electron group geometry and molecular geometry are different.
The electron group geometry refers to the arrangement of all electron pairs around a central atom, including both bonding and lone pair electrons. On the other hand, the molecular geometry only considers the arrangement of atoms in a molecule.
When there are no lone pairs present on the central atom, the electron group geometry and molecular geometry will be the same. However, if there are lone pairs on the central atom, the electron group geometry and molecular geometry will be different.