Pasted in problem, which is simple addition.
229
229
229
171
beta particle
Beta -apex- :D
6
HYDROGEN
171
171
91
It is not a chemical reaction! You can write U-235, with atomic number 92, plus a neutron, produces two fission product nuclei (which can be various combinations) plus two or three free neutrons. The limitations of notation on this site does not allow to show this properly. If you look up nuclear fission in Wikipedia you will see how such a reaction is written.
Beta decay
beta particle
Beta -apex- :D
beta particle apex
0.88
6.5
-6
It is: -5+1+8+5 = 9