Decay series, such as that shown in(Fig. Below), can be classified
l a. gq7xg6(uzg9mo8tinto four families, depending on whether the mass numbers h
o (7zg.qtxlg8 g6m9auave the form $4n$, $4n+1$, $4n+2$, or $4n+3$, where $n$ is an integer. Justify this statement and show that for a nuclide in any family, all its daughters will be in the same family.