1.

According to the nuclear reaction \[_{4}Be{{+}_{2}}H{{e}^{4}}{{\to }_{6}}{{C}^{12}}{{+}_{0}}n{{}^{1}}\], mass number of \[(Be)\] atom is [AFMC 2002]

A.                 4             
B.                 9
C.                 7             
D.                 6
Answer» C.                 7             


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