| Answer | Crossword Clue |
|---|---|
| IONIUM | Radioactive isotope |
| THORON | Radioactive isotope |
| IONIUM | Radioactive isotope having mass 230 |
| IONIUM | Thorium isotope |
| THORON | Radon isotope |
| ATOMS | Isotope units |
| IONIUM | Isotope of thorium |
| ISOTRONS | Uranium isotope separators. |
| MSTH | Radium isotope: Abbr. |
| TRITIUM | Isotope of hydrogen |
| ATOM | Isotope, e.g. |
| THORON | Isotope of radon |
| TRACER | Medical-exam isotope |
| TERIUM | Hydrogen isotope, mass 3. |
| NEUTRONS | Components of an isotope number |
| CARBONSEVEN | Dating isotope that's half as accurate? |
| DEUTERON | Nucleus of hydrogen isotope, mass 2. |
