M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:	Through a lengthy decay process, compound X becomes compound Y. Compound X has 92 protons and an atomic mass of 238. Compound Y has 73 protons and an atomic mass of 198. Which of the following represents a potential decay reaction that could yield compound Y?

10 alpha decays

5 alpha decays, followed by 1 beta decay, followed by 5 alpha decays

10 alpha decays followed by 2 gamma decays

5 alpha decays, followed by 1 electron capture, followed by 5 alpha decays