| deplete water | 0.41 |
| account for approximate… | 0.38 |
| undergo nuclear fusion | 0.25 |
| one proton | 0.68 |
| neutron | 0.65 |
| tritium | 0.43 |
| one electron | 0.25 |
| stable | 0.51 |
| abundant | 0.47 |
| more common | 0.30 |
| heavy | 0.25 |
| an isotope of hydrogen | 0.61 |
| stable isotope | 0.38 |
| destroyed | 0.51 |
| produced in the big bang | 0.51 |
| extracted | 0.47 |
| used as non-radioactive… | 0.38 |
| substituted for hydrogen | 0.30 |
| converted to helium | 0.30 |
| produced by rare cluste… | 0.25 |