Dispersion forces are present between all molecules, whether they are polar or nonpolar. In a larger atom or molecule, the valence electrons are, on average, farther from the nuclei than in a smaller atom or molecule. They are less tightly held and can more easily form temporary dipoles.
Also asked, can polar molecules have dispersion forces?
Since all molecules have electrons, they all exhibit dispersion forces to some extent. As a result, non-polar molecules with no dipole-dipole interactions can have much stronger IMF than polar molecules that have both dispersion and dipole-dipole attractions - so yes, size matters.
What molecules have only London dispersion forces?
These London dispersion forces are often found in the halogens (e.g., F2 and I2), the noble gases (e.g., Ne and Ar), and in other non-polar molecules, such as carbon dioxide and methane. London dispersion forces are part of the van der Waals forces, or weak intermolecular attractions.
Do we have London forces in polar molecules?
London dispersion forces come about when the electrons from two separate atoms/molecules move around..this then creates an instantaneous dipole. These ARE present in all atoms and molecules. But, it is important to realize how weak these forces are. With dipole-dipole forces, these ONLY exist between polar molecules.
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