| Answer | Crossword Clue |
|---|---|
| TERIUM | Hydrogen isotope, mass 3. |
| DEUTERON | Nucleus of hydrogen isotope, mass 2. |
| deuterium | heavy hydrogen, an isotope of hydrogen of double mass |
| protium | the ordinary light hydrogen isotope of atomic mass 1 |
| deuteriums | DEUTERIUM, heavy hydrogen, an isotope of hydrogen of double mass |
| deuterium | isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbol: D; at. wt.: 2.01; at. no.: 1 |
