A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme:
The mass number and atomic number of A are 180 and 72 respectively. What are these numbers for A 4 ?
Solution:
A has mass number as 180 and atomic number 172 .
Formation of A 1 by α-decay:
Formation of A 2 by β decay:
Formation of A 4 :
In r -decay, mass number and atomic number remain the same.
Thus,
Mass number of A 4 = 172
Atomic number of A 4 = 169
please check the atomic no its not 172 but it is 72.the procedure is correct go ahead