Answer:
Pb-210 that lead-210 is the product of second step.
Explanation:
Alpha decay : When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the mass number and atomic number is reduced by 4 and 2 units respectively.
General representation of alpha decay :
[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha[/tex]
Beta decay : In this process, a neutron is converted into a proton and an electron. In this decay, the atomic number is increased by 1 unit.
General representation of beta decay :
[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^{A}Y+_{-1}^0e[/tex]
Step 1. Bi undergoes α decay;
[tex]_Z^A\textrm{X}\rightarrow _{81}^{210}Tl+_2^4\alpha[/tex]
81 = Z-2
Z = 83
210 = A - 4
A = 214
[tex]_{83}^{214}\textrm{X}\rightarrow _{81}^{210}Tl+_2^4\alpha[/tex]
Step 2: Tl-210 undergoes β decay:
[tex]_{81}^{210}\textrm{X}\rightarrow _{82}^{210}Pb+_{-1}^0e[/tex]
Pb-210 that lead-210 is the product of second step.
