no working problem. 80 from Chapter four. His problem asks us, Why are some Adam's radio? So some atoms are radioactive, depending on the stability of the nucleus. So stability of a nucleus in an Adam depends on Nushawn Proton ratio. So when this ratio is too large or too small, particularly, uh, when it is too small, the nucleus will become unstable. This well is the atom itself, and this instability creates radio activity is likely to undergo nuclear reactions.