A radioactive element X(A,Z), on emitting an alpha particle, changes into
Correct answer: C. Y(A-4,Z-2)
- A. Y(A,Z-2)
- B. Y(A-4,Z)
- C. Y(A-4,Z-2)
- D. Y(A,Z+2)
Explanation
C is the right option because When a radioactive element X emits an alpha particle, it loses 2 protons and 2 neutrons. This means the resulting nucleus will have 2 fewer protons and 2 fewer neutrons. Therefore, the daughter nucleus Y will have a mass number (A-4) and an atomic number (Z-2).
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