When Lead-214 undergoes beta decay, Bismuth-214 is formed in addition to the beta particle.
Beta decay is a form of radioactive decay in which an electron is emitted by the atom of the element undergoing decay and the atomic number of the element increases by 1 to form a new element. In addition, radiation is emitted.
When Lead-214 undergoes beta decay, the products formed are as follows:
[tex]^{214}_{82}Pb \rightarrow ^{214}_{83}Bi + ^{0}_{-1}e[/tex]
Therefore, when Lead-214 undergoes beta decay, Bismuth-214 is formed in addition to the beta particle.
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