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An element of nuclear number A and proton number Z emits an alpha particle from...

Physics
NECO 2000

An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively

  • A. (A – 2) and (Z – 2)
  • B. (A + 4) and (Z + 2)
  • C. (A– 4) and (Z+2)
  • D. (A+ 4) and (Z – 2)
  • E. (A – 4) and (Z – 2)
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Correct Answer: Option E
Explanation

Let the element be S and the element formed after emission be X.

\(\implies ^{A} _{Z}S \to ^{4} _{2}He + X\)

\(\therefore X = ^{A - 4} _{Z - 2}X\).

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