The chart below shows part of the radioactive series beginning with the isotope
)The isotope marked with an X is
A) .
B) .
C) .
D) .
E) .

Question

The chart below shows part of the radioactive series beginning with the isotope 
)The isotope marked with an X is 
A) . 
B) . 
C) . 
D) . 
E) .

Quizplus · Accepted Answer

The radioactive series begins with the isotope marked TB2295_11 and progresses towards the isotope marked X. We can see that the isotope marked TB2295_11 has an atomic number of 90 and a mass number of 234. The isotope marked X has an atomic number of 82 and a mass number of 206. Therefore, we can look for a decay process that involves the loss of 8 protons and 28 neutrons. The only option that fits this criteria is option B, which shows the decay of radium-226 to radon-222 through the emission of an alpha particle.

The Chart Below Shows Part of the Radioactive Series Beginning