An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively?

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A. P – 4 and Q + 2
B. P – 4 and Q – 2
C. P + 2 and Q + 2
D. P + 2 and Q – 2

Correct Answer: Option B

B. P – 4 and Q – 2

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