What is the main product when
Pa undergoes alpha decay?

Question

What is the main product when 
Pa undergoes alpha decay?

Quizplus · Accepted Answer

When an atom undergoes alpha decay, it emits an alpha particle, which consists of two protons and two neutrons. This decreases the atomic number by two and the mass number by four. In this case, the parent atom has an unknown symbol represented by "Pa," which has an atomic number of 91. After undergoing alpha decay, the resulting atom has an atomic number of 89 and a mass number of 225. Looking at the possible products, only option D (11ea8a6b_bbee_6da8_9ee3_3d87a1ff7f35_TB6109_11 Ac) fits this description.

What Is the Main Product When