The noble gases have low boiling points.
But their boiling points do increase as you move down the periodic table. This is because the relative atomic mass increases lower down the periodic table.
why?
1 answer
The boiling point of an element is influenced by the strength of the intermolecular forces between its atoms or molecules. In the case of noble gases, the only intermolecular force present is the weak van der Waals force, which arises due to the fluctuations in electron density around the atoms. The strength of this force increases with increasing atomic or molecular size, because larger atoms/molecules have more electrons and therefore a larger electron cloud that can be distorted, leading to greater attractions between them. Therefore, as we move down the group of noble gases, the atomic size and relative atomic mass increase, resulting in stronger van der Waals forces and higher boiling points.