Gas that glows when condensed Crossword Clue

Today's (12 January 2019) crossword provided to us by L.A. Times Daily and the clue is "Gas that glows when condensed".
The right answer or rather the best answer for the "Gas that glows when condensed" is:

Best Answer RADON

Crossword Date: 12 January 2019

Note: The L.A. Times Daily clue "Gas that glows when condensed" has multiple solutions for the given crossword puzzle. We apologize for the confusion, especially if there are other solutions to this crossword.
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