1.

Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element X produced in the following nuclear reaction \[_{95}^{249}Cf+_{7}^{15}N{{\to }_{105}}X+4_{0}^{1}n\]    [AMU (Engg.) 2002]

A.        261
B.        264
C.        260        
D.        257
Answer» D.        257


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