# Why hydrogen bonds are formed?

Hydrogen bonds occur where hydrogen is covalently bound to a strongly electronegative element, e.g. $\text{N", "O", "X}$ ("X" = halogen).
If hydrogen is bound to a strongly electronegative element, the electrons in the bond are polarized towards the electronegative element. We could therefore represent the polarized molecule as ${\text{H"^(delta+)-"X}}^{\delta -}$.
The $\text{H"-"X}$ molecule is thus polarized, it unequally shares its electrons. In the context of other similar molecules, this becomes an intermolecular force that is reflected in the elevated boiling points of $\text{H"_2"O}$, and $\text{H"-"F}$. This intermolecular force is the hydrogen-bonding interaction.