Question

A nucleus ${}_{Z}^{A}X$ emits an α-particle. The resultant nucleus emits a $\beta^{+}$particle. The respective atomic and mass no. of the final nucleus will be.

• A. Z – 3, A – 4
• B. Z – 1, A – 4
• C. Z – 2, A – 4
• D. Z, A – 2

Answer 1

Answer: (A)

Z – 3, A – 4

Answer 2

${}_{Z}^{A}X \rightarrow_{Z - 2}^{A - 4}Y +_{2}^{4}He \rightarrow_{Z - 3}^{A - 4}Z +_{1}^{0}B$