# What are molecular dipoles?

Jul 8, 2015

Molecular dipoles exist if one or more of the atoms is more electronegative than the other(s)

#### Explanation:

The most common dipole is water.

Since $O$ is more electronegative than $H$ the shared electrons tend to be more in the neighbourhood of the $O$-atom.
Since the molecule is 'bent' they tend to be more in the upper part of the figure above. This gives a slight negative charge (called $\delta -$) at the top, and a $\delta +$ at the $H$-arms.

Since $+$ and $-$ attract, the next molecule will tend to turn one of its $H$ 's toward the $O$ of the first one.

This polarity also has many consequences for the behaviour of a polar liquid like boiling point, solvability, etc. and even the shape of snow flakes.