| Clue | Source | Date |
|---|---|---|
| Describing certain atoms, is oxygen at issue? (8) | The Guardian Cryptic | 12 May 2025 |
| Iodine like that: matter like tritium? | ||
| One's issue about oxygen, or about its forms? | ||
| Relating to different forms of an element | The Times Concise | 23 Mar 2020 |
| Is old principal in charge of radioactive type? | Irish Times Crosaire | 05 Sep 2016 |
| Like different forms of the same element | The Times Concise | 31 Jul 2015 |
| Of an atomic form |