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Modern Physics — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsModern Physics1 Mark
Question
When does the nucleus of an atom tend to be radioactive?
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Answer

The nucleus of an atom tends to be radioactive when:
(a) its atomic number exceeds 82.
(b) there is an imbalance of protons and neutrons as compared to a normal stable atom.

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