An
example of fission is when a uranium isotope 235
92 U  bombarded with a
neutron breaks into two intermediate mass nuclear fragments
1
235
236
144
89
1
0
92
92
56
36
0
n
U
U
Ba
Kr
3 n
+
→
→
+
+
(13 10)
The same reaction can produce other pairs of intermediate mass
fragments
1
235
236
133
99
1
0
92
92
51
41
0
n
U
U
Sb
Nb
4 n
+
→
→
+
+
(13 11)
Or, as another example,
1
235
140
94
1
0
92
54
38
0
n
U
Xe
Sr
2 n
+
→
+
+
(13 12)
The fragment products are radioactive nuclei; they emit b particles in
succession to achieve stable end products