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An element of nuclear number A and proton number Z emits ...

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)

Correct answer is E

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

AZS42He+X

.