Hydrogen+Bonding

Hydrogen bonds - A hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Although stronger than most other intermolecular forces, the hydrogen bond is much weaker than both the ionic bond and the covalent bond. As the name "hydrogen bond" implies, one part of the bond involves a hydrogen atom. The hydrogen must be attached to a strongly electronegative atoms such as oxygen, nitrogen or fluorine. - One of the most simplest example of a hydrogen bond is found between water molecules. Water has two hydrogen atoms and one oxygen atom; two molecules of water can form a hydrogen bond between them. The oxygen of one water molecule has two long pairs of electrons, each of which can form a hydrogen bond with hydrogens on two other water molecules. Water has high boiling point and this is because of the high number of hydrogen bonds each molecule can have relative to its low molecular mass.