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: E