Short answerEasy2 marks
A nucleus ₈₄X²⁰² of an element emits an alpha particle followed by a beta particle. The final nucleus is ₐYᵇ. Find a and b.
Topic: Nuclear physics / radioactivity
Previous-year question practice database
Answer
Exam answer
a = 83, b = 198.
Explanation
After α: Z 84→82, A 202→198; after β⁻: Z 82→83, A unchanged.
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