Which isotope is produced when ²²²Rn decays by emitting two $\alpha$ particles?

Question

Quizplus · Accepted Answer

When Rn decays by emitting two alpha particles (each alpha particle consists of 2 protons and 2 neutrons), the atomic number decreases by 4 (2 protons per alpha particle) and the mass number decreases by 8 (4 nucleons per alpha particle). Starting with Rn (atomic number 86, mass number 222), after emitting two alpha particles, the atomic number becomes 82 (86-4) and the mass number becomes 214 (222-8), which corresponds to lead (Pb).

Which Isotope Is Produced When 222Rn Decays by Emitting Two α\alphaα

Which Isotope Is Produced When ²²²Rn Decays by Emitting Two $\alpha$