A nucleus of Thorium-232 (90232Th^{232}_{90}\text{Th}90232Th) undergoes a decay series consisting of three α \alpha\,α emissions and two β−\beta^-β− emissions.
Which nuclide is the final product of this decay series?
82220Pb^{220}_{82}\text{Pb}82220Pb
86220Rn^{220}_{86}\text{Rn}86220Rn
84220Po^{220}_{84}\text{Po}84220Po
88224Ra^{224}_{88}\text{Ra}88224Ra
