Question

A radioactive element ^A _zX loses two successive β-particles and then an alpha particle, such that the resulting nuclide ^P _QY is Calculate the values of P and Q.

Answer 1

When ^A _zX loses first β-particle atomic number of daughter nucleus Y increases by one and mass number remains the same 

When ^A _z+1X loses another β-particle changes to daughter nucleus Z and atomic number again increases by one and mass number still remains the same A.