Isotopes of Hydrogen
List of known isotopes of the element Hydrogen.
| Isotope | t½ | % | Spin/parity | Radius | Isotopic mass | Discovery |
|---|---|---|---|---|---|---|
| 1H | stab. | 99.98 ±0.0078 % | 1/2+ | 0.8783 ±0.0086 fm | 1.007·106 ±1.4·10-5 keV/c2 | 1920 |
| 2H | stab. | 0.0145 ±0.0078 % | 1+ | 2.142 ±0.0088 fm | 2.014·106 ±1.5·10-5 keV/c2 | 1932 |
| 3H | 12.32 ±2 a | syn. | 1/2+ | 1.759 ±0.0363 fm | 3.016·106 ±8·10-5 keV/c2 | 1934 |
| 4H | stab. | syn. | 2- | — | 4.026·106 ±107.3 keV/c2 | 1981 |
| 5H | 5.3 ±4 MeV | syn. | (1/2+) | — | 5.035·106 ±96.02 keV/c2 | 1987 |
| 6H | 1.55 ±44 MeV | syn. | — | — | 6.044·106 ±272.8 keV/c2 | 1984 |
| 7H | 0.09 ± MeV | syn. | (1/2+) | — | 7.052·106 ±1,078 keV/c2 | 2003 |
1HHydrogen-1
| Classification | z: 1; n: 0; m: 1 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | 99.98 ±0.0078 % |
| Spin/parity | 1/2+ |
| Discovery | 1920 |
| Mass excess | 7,288 ±1.3·10-5 keV |
| Q value for electron capture | -782.4 keV |
| Magnetic dipole moment | 2.792 ±8.999·10-9 μN |
2HHydrogen-2
| Classification | z: 1; n: 1; m: 2 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | 0.0145 ±0.0078 % |
| Spin/parity | 1+ |
| Discovery | 1932 |
| Mass excess | 13,130 ±1.5·10-5 keV |
| Binding energy | 1,112 ±2·10-4 keV |
| Single-particle energy | 2,224 ±4·10-4 keV |
| Neutron separation energy | 2,224 ±4·10-4 keV |
| Magnetic dipole moment | 0.8574 ±5·10-9 μN |
| Electric quadrupole moment | 0.002857 ±3·10-7 b |
3HHydrogen-3
| Classification | z: 1; n: 2; m: 3 |
|---|---|
| Half life | 12.32 ±2 a |
| Natural abundance | synthetic nuclide |
| Spin/parity | 1/2+ |
| Decay modes | β⁻ decay |
| Discovery | 1934 |
| Mass excess | 14,940 ±8·10-5 keV |
| Binding energy | 2,827 ±3·10-4 keV |
| Neutron separation energy | 6,257 ±4·10-4 keV |
| β⁻ decay energy | 18.59 ±6·10-5 keV |
| Magnetic dipole moment | 2.978 ±1.4·10-8 μN |
4HHydrogen-4
| Classification | z: 1; n: 3; m: 4 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | synthetic nuclide |
| Spin/parity | 2- |
| Discovery | 1981 |
| Mass excess | 24,620 ±100 keV |
| Binding energy | 1,720 ±25 keV |
| Neutron separation energy | -1,600 ±100 keV |
| β⁻ decay energy | 22,190 ±100 keV |
| β⁻ decay energy with neutron | 1,618 ±100 keV |
5HHydrogen-5
| Classification | z: 1; n: 4; m: 5 |
|---|---|
| Half life | 5.3 ±4 MeV |
| Natural abundance | synthetic nuclide |
| Spin/parity | (1/2+) |
| Decay modes | two-neutron emission |
| Discovery | 1987 |
| Mass excess | 32,890 ±89.44 keV |
| Binding energy | 1,336 ±17.88 keV |
| Neutron separation energy | -200 ±134.1 keV |
| β⁻ decay energy | 21,660 ±91.65 keV |
| β⁻ decay energy with neutron | 22,390 ±89.44 keV |
6HHydrogen-6
| Classification | z: 1; n: 5; m: 6 |
|---|---|
| Half life | 1.55 ±44 MeV |
| Natural abundance | synthetic nuclide |
| Discovery | 1984 |
| Mass excess | 41,870 ±254.1 keV |
| Binding energy | 961.6 ±42.35 keV |
| Neutron separation energy | -912 ±269.4 keV |
| β⁻ decay energy | 24,280 ±254.1 keV |
| β⁻ decay energy with neutron | 22,570 ±254.9 keV |
7HHydrogen-7
| Classification | z: 1; n: 6; m: 7 |
|---|---|
| Half life | 0.09 ± MeV |
| Natural abundance | synthetic nuclide |
| Spin/parity | (1/2+) |
| Discovery | 2003 |
| Mass excess | 49,130 ±1,004 keV |
| Binding energy | 940 ±143 keV |
| Neutron separation energy | 812 ±1,036 keV |
| β⁻ decay energy | 23,060 ±1,004 keV |
| β⁻ decay energy with neutron | 23,470 ±1,004 keV |