1.

A nucleus \[_{Z}^{A}X\] emits an a-particle. The resultant nucleus emits a \[{{\beta }^{+}}\]particle. The respective atomic and mass no. of the final nucleus will be                                                                [MP PET 2000]

A.            Z ? 3, A ? 4                            
B.            Z ? 1, A ? 4
C.            Z ? 2, A ? 4                            
D.            Z, A ? 2
Answer» B.            Z ? 1, A ? 4


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