12.
The total number of α particles, β particles emitted for the transformation of 232U --- 220 Ac and how many steps will take place for above transformation :
A:
3α, 3β, 6 steps
B:
3α, 3β, 3 steps
C:
4α, 2β, 6 steps
D:
4α, 2β, 3 steps
The answer is:
A
