Enter a clue or pattern or both:
The Clue
Krypton, for one (7 letter answer)
The Answer
RAREGAS
Tags
Notes
The answer RAREGAS is rarely seen, appearing only about once every 1800 puzzles.
Related Clues
Neon, for one
Noble one
Krypton, e.g.
One highly unlikely to react
Last-column element on the periodic table