The lightest element which exhibits radioactivity is:
Correct answer: C. Tritium
- A. Hydrogen
- B. Deuteron
- C. Tritium
- D. Helium
Explanation
Tritium is the only radioactive isotope of hydrogen and the other two have stable nuclei. As hydrogen is the lightest element in the periodic table, tritium will be the lightest radioactive isotope in the periodic table.
Last updated
About Nuclear Physics
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
Practise Nuclear Physics
1,254 free Nuclear Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.