The boiling point increases down the zero group element due to_________________?
Correct answer: B. London forces
- A. Ion dipole forces
- B. London forces
- C. Hydrogen bonding
- D. Dipole dipole forces
Explanation
The boiling points of noble gases increase down Group 18 because larger atoms have more electrons and stronger London dispersion forces. Students may choose dipole-dipole forces, but noble gases are non-polar and do not have permanent dipoles.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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