Enter a clue or pattern or both:
The Clue
Gas in fluorescent lamps (7 letter answer)
The Answer
KRYPTON
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Notes
The answer KRYPTON is so rare that it appears less than once every 2500 puzzles.
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Definition
KRYPTON as a noun:
1. (krypton, Kr, atomic number 36) = a colorless element that is one of the six inert gasses; occurs in trace amounts in air