Answer:
Electron geometry and molecular geomtry are the same without the presence of unpaired electrons.
Explanation:
The unpaired electrons (lone pairs) occupy more space than bonding electrons (they expel more) that makes the shape of molecule change.
Take Methane (CH4) for example of no lone pairs case:
Carbon has 4 valence electrons (outermost-shelled electrons) and it uses all four electrons to form bonds with 4 Hydrogen atoms so that there is no unpaired electron. Its electron geometry is tetrahedral so is its molecular geometry.
Take water (H2O) molecule for example:
Its structure is H-O-H. It's supposed to be linear (180 degree) but thanks to two lone pairs of Oxygen (Oxygen has 6 valence electrons, it only uses 2 electrons to form bonds with two Hydrogen atoms), its shape changes.
The electron geometry is tetrahedral whereas the molecular geometry is bent (its angle is approximately 104.5 degree) because two lone pairs expel the two bonds between H and O atoms.
