What is the trend in boiling points as you go down Group 0?

As you descend Group 0, also known as the noble gases, the trend in boiling points indeed shows an increase. This is because the noble gases are monatomic and exist as single atoms, which leads to very weak van der Waals forces (dispersion forces) between them.

As you move down the group from helium to radon, the atomic size increases due to an increase in the number of electron shells. Larger atoms have a higher number of electrons, which leads to stronger temporary dipoles and thus stronger van der Waals forces. These stronger intermolecular attractions require more energy to overcome, causing the boiling points to rise.

The noble gases experience this trend distinctly due to their full outer electron shells, preventing them from forming bonds with other elements and leading to their unique physical properties, including their increasing boiling points as you go down the group.