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A bigger atomic radii increases the polarizability of the molecule which increases the amount of induced dipole- induced dipole forces in a body of that molecule. More intermolecular forces will lead to a higher boiling point. In short, bigger atomic size leads to a higher boiling point.
To add on, a bigger atomic radii would mean they have more electrons and more opportunities to create dipole-dipole forces. The larger the atomic radii basically means larger atomic size, which would therefore create more London-dispersion forces. Since bigger atomic size means stronger intermolecular forces, the boiling point must be higher as well.
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