# Why are polar molecules said to have dipoles?

Jun 1, 2018

Well, what is a dipole...?

#### Explanation:

A dipole is a physical separation of positive and negative charge. Given electronegative atoms within a MOLECULE, i.e. atoms that strongly polarize electron density towards themselves, charge separation occurs, and molecular dipoles are formed...

And let us consider a couple of molecular dipoles, say, $H F$, and ${H}_{2} O$....both oxygen and fluorine atoms are electronegative with respect to hydrogen....and there is unequal distribution of electronic charge in the molecule...the which we could represent as...$\stackrel{+ \delta}{H} - \stackrel{- \delta}{F}$, or ${\stackrel{+ \delta}{H}}_{2} \stackrel{- \delta}{O}$...I leave it to you to look up the molecular dipole moments...