* Polar Bonds: These occur when two atoms with different electronegativities share electrons. One atom attracts the shared electrons more strongly, creating a partial negative charge (δ-) on that atom and a partial positive charge (δ+) on the other.

* Polar Molecules: These are molecules where the uneven distribution of charge creates a net dipole moment. This means the molecule has a distinct positive end and a distinct negative end.

The key is that a molecule must have at least two atoms to be polar. A single atom, even if it has a polar bond, cannot be a polar molecule.

Example:

* Hydrogen chloride (HCl): This molecule has a polar bond because chlorine is more electronegative than hydrogen. The chlorine atom attracts the shared electrons more strongly, making the molecule polar.

* Hydrogen (H2): This molecule is nonpolar because the two hydrogen atoms have the same electronegativity, so the shared electrons are evenly distributed.

So, the answer to your question is: There is no molecule that has a polar bond but is not a molecule. A single atom cannot be a polar molecule.