Introduction to Hydrogen Bonding, a special case of permanent dipole-dipole attraction
Hydrogen Bond is an extreme case of polar covalent bonds. When hydrogen bonds with a highly electronegative atom like N,F OR O, the only electron that hydrogen has is "pulled" all the way to the other atom.
This literally leaves hydrogen's nucleus "bare and unshielded". So the hydrogen atom, void of electrons will be attracted to the electrons of the electronegative atom on an adjacent molecule.
A quick idea of how hydrogen bonds form
For a better idea of how to draw hydrogen bonds, watch this video.
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