If Rn-222 loses an alpha particle the resulting isotope is

Question

Quizplus · Accepted Answer

When Rn-222 loses an alpha particle, it means it loses two protons and two neutrons. Therefore, the resulting isotope will have an atomic number that is two less than Rn-222, and an atomic mass that is four less. Option D, Po-218, fits these criteria. Option A, Pb-218, has an atomic number that is two less than Rn-222, but an atomic mass that is only two less, so it cannot be the correct answer. Option B, At-222, has the same atomic number as Rn-222, so it cannot be the correct answer. Option C, Fr-222, has an atomic number that is one more than Rn-222, so it cannot be the correct answer.

If Rn-222 Loses an Alpha Particle the Resulting Isotope Is