| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| 6 noble gases were discovered between 1894 & 1900 with argon being the first & this one, Rn, the last | radon | $1,200 | DJ | GENERAL SCIENCE | 2017-05-10 | #7528 | |
| Unwelcome in basements, this radioactive element is the heaviest of the noble gases | Radon | $500 | J | SCIENCE STUFF | 2000-09-07 | #3679 | |
| The EPA has issued warnings about this clear, odorless gas that seeps out of uranium and into people's houses | radon | $400 | DJ | SCIENCE | 1989-11-28 | #1207 |