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to add on, typically, the larger the molecule, the larger the polarizability. this is because the electrons are farther away from the nucleus and the valence electrons are more shielded from the pulling power of the nucleus.
When the intermolecular forces are stronger, it requires more energy to break the bonds, thus making the melting/boiling point higher. For example, CHI3 will have a higher melting point than CHF3 because Iodine has a higher polarizability than Fluorine, which makes the intermolecular forces stronger and melting point higher for CHI3.
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