Final answer:
After the alpha decay of 134/84 Po, the resulting atom is 130/82 Pb, which corresponds to lead (Pb).
Step-by-step explanation:
When an atom of 134/84 Po undergoes alpha decay, it emits an alpha particle. An alpha particle has two protons and two neutrons, so the atomic number decreases by 2 and the mass number decreases by 4 during the decay. Thus, the product of the decay of 134/84 Po is 130/82 Pb, indicating that the atom left after the decay is lead (Pb). Therefore, the correct answer to which atom is left after the alpha decay of 134/84 Po is A. 130/82 Pb.