Question

Why tritium is radioactive element while in general the elements whose atomic number is greater than 82 are radioactive???​

Answer 1

Answer: Tritium is a radioactive form, or “isotope”, of hydrogen. It has two neutrons where regular hydrogen does not have any, which makes tritium unstable and therefore radioactive. ... Like all radioactive isotopes, tritium decays. As it decays it gives off, or emits, beta radiation.