How do the boiling points of the noble gases change?
The boiling points of the noble gases increase as their atomic masses increase.
The boiling points of the noble gases are very low compared to those of other substances with similar masses.
This indicates that only weak London dispersion forces are present.
The dispersion forces increase as the size of the atom increases, so the boiling points also increase with atomic size.
The outer electrons are less tightly held in the larger atoms, so the electron clouds are more polarizable and the instantaneous dipoles are more easily induced.