Last seen in:
- The Times - Concise - Times Concise Jumbo No 1606
- The Times - Concise - Times Concise Jumbo No 1606
- The Telegraph - QUICK CROSSWORD NO: 29,783 - Sep 17 2021
- The Telegraph - QUICK CROSSWORD NO: 29,635 - Mar 29 2021
- The Times - Concise - Times Concise No 8478
- The Times - Concise - Times Concise No 8277
- The Sun - Two Speed - Oct 2 2019
- The Times - Concise - Times Concise No 8063
- The Washington Post - Jun 2 2019
- L.A. Times Daily - Jun 2 2019
Related Clues:
- A rum uni turns out an unstable element
- Radioactive fuel
- Radioactive material
- Dangerous home seepage
- It ends up as lead
- Gas that glows when condensed
- Heaviest of noble gasses
- Artist and lecturer are a gas
- Gas found by home test kits
- Gas trouble among sailors
- Radioactive metal used as fuel in nuclear reactors
- Stockpile that may be subject to inspection
- Retrospective acknowledgement: argon is noble gas
- Metallic element, Ce
- Gas derived from uranium