They can't bond with each other, no matter how hard they try.
More storage space.
To catch a predator. Why do white girls walk around in groups of 3 and 5? Because they can't even! Why do white people have so many pets? Because owning people is not legal anymore Would love to hear more white people-specific jokes :) They seem to be really rare.
Seizure Salad
Leave them to slug it out.
HeHe
If you can't helium, and you can't curium, then you might as well barium.
The noble gases, because they can't form bonds
A bonding agent.
Noble rocks