Answer
$^{95}Sr$
Work Step by Step
The equation provided to us is
$^{233} \mathrm{U}+\mathrm{n} \rightarrow \mathrm{X}+\mathrm{Y}+b \mathrm{n}$
In this equation we are given that
X = $^{140}$Xe and b = 1
$\therefore$ Our equation becomes
$^{233} \mathrm{U}+\mathrm{n} \rightarrow \mathrm{^{140}Xe}+\mathrm{Y}+ \mathrm{n}$
And now we have to find Y
For our calculations,
We should remember that
For neutron Z = 0 & A = 1
For Uranium Z = 92
In this case, Xenon has Z = 54
In such equations, Mass numbers & Z must be balanced to ensure that there is no mass loss on either side,
Therefore, Z for "Y" will be 92-54 = 38
Strontium has Z = 38
$\therefore$ Y must be Strontium
For A;
235+1-140-1 = 95
$\therefore$ Y = $^{95}Sr$
