Final answer:
Molecules have shapes that can be predicted using the VSEPR theory. Different shapes of molecules interact differently with odorant receptors, resulting in different smells.
Step-by-step explanation:
Molecules have shapes that can be predicted using the Valence Shell Electron Pair Repulsion (VSEPR) theory.
The VSEPR theory states that electron pairs in a molecule will arrange themselves in order to minimize repulsion between them.
Therefore, the shape of a molecule is related to the arrangement of its atoms and electron groups.
In terms of smell, molecules with different shapes will interact differently with odorant receptors in our nose, leading to different perceptions of smell.