Th 90 232 emits 6 α and 4 β particles and gets converted into a lead. The mass number and atomic…

In a nuclear reaction, conservation of mass and conservation of charge follows in other words we can say that mass number and atomic number are conserved.

${\mathrm{Th}}_{90}^{232}=6{\mathrm{\alpha }}_2^4+4{\mathrm{\beta }}_1^0+{\mathrm{Pb}}_{82}^{208}$

Hence, the mass number and atomic number of lead is, $208$and $82.$