Answer :
The radioactive isotope that undergoes α-emission to produce Bi-214 is Pb-214. Hence, the isotope is Pb-214.
Alpha (α) emission occurs when the nucleus of an atom emits an alpha particle, which consists of two protons and two neutrons. In this process, the atomic number of the original isotope decreases by 2, and the mass number decreases by 4.
Therefore, if Bi-214 is produced, it means that the original isotope must have had an atomic number 2 less than bismuth, which is lead (Pb) with atomic number 82. Hence, the isotope is Pb-214.
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