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 rarr ._(105)X + 4 ._(0)^(1)n

Answer»

261
264
260
257

Solution :EQUATE ATOMIC no. and MASS no.


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