Intermolecular Forces
Intermolecular Forces
Intermolecular
forces are the forces of attraction and repulsion between interacting parties
(atoms and molecules). This term does not include the electrostatic forces that
exist between the two oppositely charged ions and the forces that hold atoms of
a molecule together i.e., covalent bonds.
Attractive
intermolecular forces are known as Vas der Waals forces, in honour of Dutch
scientist Johannes van der Waals (1837-1923), who explained the deviation of
real gases from the ideal behavior through these forces. We will learn about
this later in this unit. Van der Waals forces vary considerably in magnitude
and include dispersion forces or London forces, dipole-dipole forces, and
dipole-induced dipole forces. A particularly strong type of dipole-dipole
interaction is hydrogen bonding. Only a
few elements can participate in hydrogen bond formation, therefore it is
treated as a separate category.
At this
point, it is important to note that attractive forces between an ion and a
dipole are known as ion-dipole forces and these are not van der Waals forces.
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