## College Physics (7th Edition)

$\beta^{-}$ decay occurs to $^{14}C$ with $Z\lt82$ to form $^{14}N$. $\beta^{-}$ decay also occurs to $^{239}U$ with $Z\gt82$ to form $^{239}Np$. These examples shows that the $\beta^{-}$ decay can occur regardless of the Z value.