If they do exist, then the answer was definitely 'Van der Waals'. In addition, I'm not sure if Van der Waals forces exist for metallic bonds. This force can then be broken and can be reformed with another molecule as they change and occur very quickly. First of all, there's no such thing as a metallic force. For example when two molecules that are non polar come close to each other one will have a dipole causing a dipole to be created in the adjacent molecule, this creates a temporary and weak attraction known as a london dispersion forces. When this dipole is induced the molecule next to it will be influenced and this will cause a dipole to be induced (created) in this molecule. These ions are held by strong attractive forces to. This is important as it has an affect on adjacent molecules. A sea of free, delocalized electrons is formed surrounding a lattice of positively charged metal ions. This is known as a temporary dipole as it happens quickly and for a very small amount of time. This means that one of the atoms in the molecules has a small negative charge and the other end has a small positive charge. London dispersion forces occur when one molecule exhibits a small and temporary dipole, a slight change in the layout of the electron cloud where for a short moment it is more on one atom than another. In ethanol, C2H5OH (1), there are covalent bonds, hydrogen bonds and van der Waals forces. These are molecules where the electronegativity difference between the atoms is not greater than 0.5 on the pauling scale. London dispersion forces exist in non polar molecules.
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