Explanation:
A nuclear fission reaction is defined as the reaction in which a heavy nucleus splits into small nuclei along with release of energy.
The given reaction is [tex]^{235}_{92}U + ^{1}_{0}n \rightarrow ^{144}_{58}Ce + ^{90}_{38}Sr + x^{1}_{0}n + y^{0}_{-1}\beta[/tex]
Now, we balance the mass on both reactant and product side as follows.
     235 + 1 = [tex]144 + 90 + (x \times 1) + (y \times 0)[/tex]
      236 = 234 + x
      x = 236 -234
        = 2
So, now we balance the charge on both reactant and product side as follows.
       92 + 0 = [tex]58 + 38 + (x \times 0) + (y \times -1)[/tex]
        92 = 96 - y
         y = 4
Thus, we can conclude that there are 2 neutrons and 4 beta-particles are produced in the given reaction.
Therefore, reaction equation will be as follows.
      [tex]^{235}_{92}U + ^{1}_{0}n \rightarrow ^{144}_{58}Ce + ^{90}_{38}Sr + 2^{1}_{0}n + 4^{0}_{-1}\beta[/tex]
