INERTGAS
| Date | Clue |
|---|---|
| 2025-07-29 | Argon or neon |
| 2024-12-01 | Xenon, e.g. |
| 2021-06-05 | It won't react well |
| 2020-07-12 | Noble thing |
| 2019-12-21 | He is one |
| 2018-06-24 | Neon, e.g. |
| 2012-12-13 | It's hard to get a reaction out of it |
| 2011-07-30 | It's hard to get a reaction out of it |
| 2008-12-12 | Noble thing |
| 2006-07-12 | Krypton, e.g. |
| 2004-09-17 | Neon or helium |