Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 

Dipole Moment of a Molecule

Molecular Orbital Energy Diagrams

Overview of Molecular Orbital Theory

VSEPR Theory for Determination of Electron Pair Geometries