Enter a clue or pattern or both:

The Clue

Krypton, for one (7 letter answer)

The Answer

RAREGAS

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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