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    $\begingroup$ It is just 1 special case among hundreds other cases of radioactive beta decay. // Pay more attention to prior search before asking. // Review the guides Asking and How to ask to prevent misunderstanding, need of clarification, objections, downvoting or closure. $\endgroup$
    – Poutnik
    Commented Jul 23, 2023 at 10:40
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    $\begingroup$ Note that there is a semi-empirical rule that elements with odd proton number have maximally 2 stable isotopes. And another rule, if there are 2 isotopes of neighbor elements with the same nucleon number, maximally one is stable ( the one with lower energy). $\ce{^3He}$ has lower energy than $\ce{^3H}$. $\endgroup$
    – Poutnik
    Commented Jul 23, 2023 at 10:43
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    $\begingroup$ The neutron is an inherently unstable subatomic particle. An isolated neutron decays with a half-life of about 10 minutes. The real surprise is that, in atomic nuclei, the neutron decay rate can be suppressed by 20 orders of magnitude or more. $\endgroup$
    – Nicolau Saker Neto
    Commented Jul 23, 2023 at 10:48
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    $\begingroup$ Nothing repels the proton. That refers to the electrostatic/electromagnetic force. Radioactivity is driven by the internuclear forces. $\endgroup$
    – Oscar Lanzi
    Commented Jul 23, 2023 at 11:33
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    $\begingroup$ physics.stackexchange.com/questions/303657/… $\endgroup$
    – M06-2x
    Commented Jul 23, 2023 at 14:57