[问答题]
Decay series, such as that shrp la/i,li v6,own if)enhcj*zm)jiizn ,,g( 6u)t n(Fig. Below), can be classified into four families, depending on whether then)fi ,c6m g(ezzhjj), t nu*)i mass numbers have 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.
