In what type of radioactive decay are the mass numbers of the parent and daughter nuclei different?
A)alpha
B)beta
C)gamma
D)both alpha and beta
E)both beta and gamma

Question

Quizplus · Accepted Answer

In alpha decay, the mass number of the parent nucleus decreases by 4 units because it emits an alpha particle, which consists of 2 protons and 2 neutrons. Beta and gamma decays do not change the mass number of the nucleus.

In What Type of Radioactive Decay Are the Mass Numbers