Why is Radon the designated driver?

Because Hydrogen and Helium are always too high

What do you call it when Argon, Neon, Krypton, Xenon, Radon, and Helium frequently attend church?

Noble Masses.

What's wrong with a joke containing Cobalt, Radon and Yttrium?

It's CoRnY

Why did the chemist got fired?

He was caught at his workplace looking at polonium radon

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