| Answer | Crossword Clue |
|---|---|
| ISOTOPES | Uranium 235 and 238 |
| ISOTOPES | Uranium 235 and uranium 238 |
| ISOTOPES | U-235 and U-238 |
| ISOTOPES | U-235 and U-238 e.g. |
| ISOTOPES | Uranium 238 and strontium 90 |
| plutonium | The chemical element of atomic number 94, a dense silvery radioactive metal of the actinide series, used as a fuel in nuclear reactors and as an explosive in nuclear fission weapons. Plutonium only occurs in trace amounts in nature but is manufactured in nuclear reactors from uranium-238 |
| ISOTOPES | Carbon 14 and uranium 235 |
