Given the equation representing a nuclear reaction in which X represents a nuclide:
232Th → He + x
Which nuclide is represented by X?
A) 236
B) 228
Ra
SS
C) 236
Ra
92
U
92
D) 228
.
Ss U

The nuclide represented as X is thorium and this is an alpha decay.

The equation shown represents an alpha decay. In an alpha decay, an alpha particle is given off.

The atomic number of the parent nucleus is greater than that of the daughter nucleus by two units while the mass number of the parent is greater than that of the daughter nucleus by four units.

Hence the equation occurs as follows;

i'm pretty sure its b i might be wrong though!