Hydrogen bonding is the weakest type of bond involved in bonding water. It is an intermolecular force that occurs between a hydrogen atom covalently bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom. In water, hydrogen bonding occurs between the hydrogen atoms of one water molecule and the oxygen atom of another water molecule. This type of bonding is responsible for the unique properties of water, such as its high surface tension, high specific heat capacity, and ability to dissolve many substances.