Nuclear reactions conserve total charge, and also conserve the total approximate mass. The other particles in the reaction will have mass = 236 - 140 - 97 = 2 . The other particles are two neutrons. Hence, (a) is not correct. For nuclei, number of protons tells the charge. So, the other particles must have charge Z such that 92 = 54 + 38 + Z ∴ Z = 0, therefore, the other particles have a total atomic mass 2 and total charge 0. Hence, only (d) is correct.