Discussion
Which isotope of hydrogen is radioactive?
Answer: D
The radioactive isotope of hydrogen is tritium.
Hydrogen has three natural isotopes: protium (one proton, no neutron), deuterium (one proton and one neutron) and tritium (one proton and two neutrons). Protium and deuterium are stable, but tritium is radioactive: it decays by beta emission to helium-3 with a half-life of about 12.3 years.
Helium is a different element, not an isotope of hydrogen, and it is also the product of tritium's decay. Protium and deuterium are hydrogen isotopes, but stable ones.
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