Decay chains[edit]
The majority of heavy hydrogen isotopes decay directly to 3H, which then decays to the stable isotope 3He. However, 6H has occasionally been observed to decay directly to stable 2H.
![{\displaystyle {\begin{array}{rcl}\\{\ce {^{3}_{1}H}}&{\ce {->[12.32\ {\ce {y}}]}}&{\ce {{^{3}_{2}He}+e^{-}}}\\{\ce {^{4}_{1}H}}&{\ce {->[139\ {\ce {ys}}]}}&{\ce {{^{3}_{1}H}+{^{1}_{0}n}}}\\{\ce {^{5}_{1}H}}&{\ce {->[>\ 910\ {\ce {ys}}]}}&{\ce {{^{3}_{1}H}+{2_{0}^{1}n}}}\\{\ce {^{6}_{1}H}}&{\ce {->[290\ {\ce {ys}}]}}&{\ce {{^{3}_{1}H}+{3_{0}^{1}n}}}\\{\ce {^{6}_{1}H}}&{\ce {->[290\ {\ce {ys}}]}}&{\ce {{^{2}_{1}H}+{4_{0}^{1}n}}}\\{\ce {^{7}_{1}H}}&{\ce {->[23\ {\ce {ys}}]}}&{\ce {{^{3}_{1}H}+{4_{0}^{1}n}}}\\{}\end{array}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a0fed4ec6f15ef58f472e349d5566f89bde2da4f)
Decay times are in yoctoseconds for all isotopes except 3H, which is expressed in years.
https://en.wikipedia.org/wiki/Isotopes_of_hydrogen#Hydrogen-1_(Protium)
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