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212 Th 228 8 Rn 5.7 yr 89AC 9Ac 228- 90 228 (i) (ii) (iii) 90 1.41 x 10° yr 6.1 min 1.9 yr

212 Th 228 8 Rn 5.7 yr 89AC 9Ac 228- 90 228 (i) (ii) (iii) 90 1.41 x 10° yr 6.1 min 1.9 yr

Chemistry In Focus
Chemistry In Focus
7th Edition
ISBN:9781337399692
Author:Tro, Nivaldo J.
Publisher:Tro, Nivaldo J.
Chapter8: Nuclear Chemistry
Section: Chapter Questions
Problem 10E
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Question

The steps below show three of the steps in the radioactive
decay chain for 232
90Th. 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?

212 Th 228 8 Rn 5.7 yr 89AC 9Ac 228- 90 228 (i) (ii) (iii) 90 1.41 x 10° yr 6.1 min 1.9 yr
Transcribed Image Text:212 Th 228 8 Rn 5.7 yr 89AC 9Ac 228- 90 228 (i) (ii) (iii) 90 1.41 x 10° yr 6.1 min 1.9 yr
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