The substances are radioactive, which have:
FIA Past Papers / All — Multiple-choice practice
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- A. Nuclei with less number of neutrons
- B. Electrons in their nuclei
- C. Electrons removed from the outermost shell
- D. Unstable nuclei
Correct answer
Unstable nuclei
Explanation
Explanation Answer: Radionuclides (or radioactive substances) are a type of chemical substance whose atomic nucleus is unstable. They achieve stability through nuclear fission (spontaneous fission, emission of alpha particles, or conversion of neutrons to protons, or vice versa).
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