Because if you can't Helium or Curium , You'd Barium!
The scientists were brainstorming.
OH NO !"
You Barium.
You barium! ba-dum-tss
There was no reaction
Noble rocks
If you can't helium, and you can't curium, then you might as well barium.
Because if you can't Helium or Curium, you Barium. (Heard it from Heimerdinger, League of Legends)