Answer:
The resulting nuclide will be polonium-214.
Explanation:
Alpha decay: It is a process in which alpha particles is emitted when a heavier nucleus decays into lighter nuclei. The alpha particle released has a charge of +2 units.
The general alpha decay reaction is given as:
[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha[/tex]
Beta-decay: It is a process in which a neutron gets converted into a proton and an electron releasing as a beta-particle. The beta particle released carries a charge of -1 units.
[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta[/tex]
Atom of polonium-218 after alpha decay and two emissions:
1) [tex]_{84}^{218}\textrm{Po}\rightarrow _{82}^{214}\textrm{Pb}+_2^4\alpha[/tex]
2) [tex]_{82}^{214}\textrm{Pb}\rightarrow _{83}^{214}\textrm{Bi}+_{-1}^0\beta[/tex]
3)[tex]_{83}^{214}\textrm{Bi}\rightarrow _{84}^{214}\textrm{Po}+_{-1}^0\beta[/tex]
The resulting nuclide will be polonium-214.
