The radioactive isotope of hydrogen is called___________?
Correct answer: A. tritium
- A. tritium
- B. deuterium
- C. protium
- D. ortho-hydrogen
Explanation
Tritium is hydrogen-3, containing one proton and two neutrons, and it is radioactive. Deuterium is hydrogen-2 and protium is hydrogen-1, and both are stable isotopes. The likely mistake is choosing deuterium because it is also a named hydrogen isotope, but it is not radioactive.
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