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In lecture last week, we learned that stronger attractive interactions could be the result of increased size or molar mass, but why is this true? Wouldn't the bonds between the two molecules be longer if they were bigger which would indicate that the bonds are weaker?
Polarizability increases as the volume of the atoms increase. This means that polarizability typically increases down a group and decreases left to right in a period. High polarizability makes molecules have larger dispersion forces that allow them to form temporary dipoles more easily. Bonds between molecules are formed by the temporary dipoles. This also means that molecules with high dispersion forces have higher boiling points as a property as well.
I was confused by this concept too, but a classmate helped explain to me that when a molecule is larger, there are more electrons and thus more potential intermolecular forces to take place within the molecule. With more electrons, the intermolecular forces will be stronger and this influence distortions in other molecules. Hope this makes sense!
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