No, Na2O is not a polar covalent molecule. It is an ionic compound composed of positively charged sodium ions (Na+) and negatively charged oxide ions (O2-). The electronegativity difference between sodium and oxygen is large, resulting in the complete transfer of electrons from sodium to oxygen, forming an ionic bond. Polar covalent molecules have a slight difference in electronegativity between the bonded atoms, resulting in a partial positive charge on one atom and a partial negative charge on the other.