Explanation

The hydrogen atom is bound by covalent bond with the atom X (fluorine, oxygen, nitrogen, etc.) with large electron-negativity and small radius. If it is close to the atom Y (the same as X) with large electron-negativity. Hydrogen is used as a medium between X and Y to generate X-H A special intermolecular or molecular white interaction in the Y form is called hydrogen bond. hydrogen bond involves a force between permanent dipoles. Its bond energy is smaller than the general covalent bond, ionic bond and metal bond bond energy, but stronger than electrostatic attraction.

Classification