RADIUM
| Date | Clue |
|---|---|
| 2026-05-13 | It was discovered by the Curies |
| 2026-03-30 | Element discovered by Marie and Pierre Curie |
| 2020-05-01 | 1898 chemistry discovery |
| 2020-04-13 | Element discovered by Marie and Pierre Curie |
| 2018-08-31 | Subject of Marie Curie's isolation |
| 2015-07-15 | Curie discovery |
| 2015-06-17 | Bygone component in luminous paint |
| 2005-11-18 | Alpha particle emitter |
| 2003-12-13 | Discovery of 1898 |