| 1. | 5H is a highly unstable isotope of hydrogen. 5H est un isotope hautement instable de l'hydrogène. |
| 2. | Its only stable isotope is 23Na. Son seul isotope stable est 89Y. |
| 3. | Carbon‑12 (12C) is an isotope of carbon. Le carbone 12 (12C) est un isotope du carbone. |
| 4. | The first isotope to be synthesized was 262Bh in 1981. Le premier isotope synthétisé est 262Bh en 1981. |
| 5. | The first isotope to be synthesized was 269Ds in 1994. Le premier isotope synthétisé est 269Ds en 1994. |
| 6. | The first isotope to be synthesized was 265Hs in 1984. Le premier isotope synthétisé est 265Hs en 1984. |
| 7. | In fact, 235U is the only naturally occurring fissile nucleus. L'isotope 235U est le seul isotope fissile naturel. |
| 8. | The first isotope to be synthesized was 263mSg in 1974. Le premier isotope synthétisé est 263mSg en 1974. |
| 9. | The first isotope to be synthesized was 243Bk in 1949. Le premier isotope synthétisé est 243Bk en 1949. |
| 10. | There may be more than one isomer for each isotope. Il peut y avoir plus d'un isomère nucléaire par isotope. |