Write the nuclear equation for the beta decay of Bi-214.
{ }_{83}^{214} \mathrm{Bi} \longrightarrow{ }_{y}^{x} ?+{ }_{-1}^{0} \mathrm{e}
{ }_{83}^{214} \mathrm{Bi} \longrightarrow{ }_{84}^{214} ?+{ }_{-1}^{0} \mathrm{e}
{ }_{83}^{214} \mathrm{Bi} \longrightarrow{ }_{84}^{214} \mathrm{Po}+{ }_{-1}^{0} \mathrm{e}