When atoms in a molecule have different electronegativities, they create polar bonds, leading to an overall dipole if the shape of the molecule does not cancel these out.

There is a great Molecular Shapes interactive on the Teachers’ Domain website, and a great website that includes many different molecular models that you can rotate and interact with .

Because of the unique way that hydrogen bonds impact the shapes and structure of molecular interactions, they're ideal candidates for focusing on in predicting the structure of a molecule. Clark ...

The ultrafast placement of an electron in a polar liquid generates collective molecular vibrations in a spherical nano-volume ...