You can get the noble gases by creating an air-cooling farm using cooling pixels. Over time, it will cause liquid pixels of the gases to spawn.
I tried that...Argon just isn't showing up. Plenty of Neon, Nitrogen, etc, etc...almost no Argon...
Try setting up in different areas - sometimes the rng only drops certain gases in an area.
I figured out...I had too much cold in a too small a space...
