When was this clue last seen?

This clue last appeared in the NYT Mini on Sunday, 28 October 2018.

Noble gas below xenon on the periodic table

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Keywords

periodicnoblebelow

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This clue appeared in the NYT Mini on Sunday, 28 October 2018. The answer RADON is a 5-letter entry.

This answer appears frequently in crosswords. View RADON answer history →

What is the answer to "Noble gas below xenon on the periodic table"?: RADON
How many letters is the answer to "Noble gas below xenon on the periodic table"?: The answer has 5 letters.
When was this clue last seen?: This clue last appeared in the NYT Mini crossword on Sunday, 28 October 2018.
Has this crossword clue appeared before?: Yes. Variations of this clue have appeared 6 other times.

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