Chapter 19, Problem 19.3P

(a)

Interpretation Introduction

Interpretation:

Among the given two isotopes ${}_{\text{79}}^{\text{173}}\text{Au}$ and ${}_{79}^{199}Au$ , which one decays by beta emission and which one decays by $\text{α-}$ emission should be identified.

Concept Introduction:

The radioactive isotopes which are neutron rich and having atomic number lesser than 83, almost all the decay occurs by beta emission.The radioactive isotopes which are neutron poor nuclides and having atomic number less than 53, all the decay occurs by either electron capture or positron emission.

(b)

Interpretation Introduction

Interpretation:

Among the given two isotopes ${}^{196}\text{Pb}$ and ${}^{\text{206}}\text{Pb}$ , which one is nonradioactive and which one decays by positron emission should be identified.

Concept Introduction:

The radioactive isotopes which are neutron rich and having atomic number lesser than 83, almost all the decay occurs by beta emission.The radioactive isotopes which are neutron poor nuclides and having atomic number less than 53, all the decay occurs by either electron capture or positron emission.