Q. $\ ^{234}U$ has 92 protons and 234 nucleons total in the nucleus. It decays by emitting an alpha particle. After the decay it becomes
A) $\ ^{232}U$
B) $\ ^{232}Pa$
C) $\ ^{230}Th$
D) $\ ^{230}Ra$
Explanation
(c) $\ _{92}^{234}U\overset{\ \ \alpha\ \ }{\rightarrow}\ _{90}^{230}Th + \alpha$
The mass number of thorium is 230 and its atomic number, $Z$ is 90
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.