The steps below show three of the steps in the radioactive decay chain for ²³²₉₀Th. The half-life of each isotope is shown below the symbol of the isotope.

(a) Identify the type of radioactive decay for each of the steps (i), (ii), and (iii).

(b) Which of the isotopes shown has the highest activity?

(c) Which of the isotopes shown has the lowest activity?

(d) The next step in the decay chain is an alpha emission. What is the next isotope in the chain?

Transcribed Image Text:

208 AC 89 228 Th 90 (iii) 228 Rn 8 232Th (i) (ii) 1.9 yr 90 6.1 min 5.7 yr 1.41 x 10' yr