Carbon.
The Big Bang Theory Season 12, Episode 23
I don't know. How do CARBON atoms
form a benzene ring?
The Big Bang Theory Season 2, Episode 13
Diamonds, crystallized CARBON.
The Big Bang Theory Season 5, Episode 12
Unit cell contains two CARBON atoms.
The Big Bang Theory Season 3, Episode 14
Needed bigger CARBON atoms.
The Big Bang Theory Season 3, Episode 14